Nope, absolutely not. It's nothing to do with him. You can't lay the blame on Angel here for what Spike should have done. If there was anybody who was going to tell Buffy Spike was alive it was him, and nothing to do with anybody else.
There's obviously a reason as to why Spike didn't tell her, or maybe hasn't told her yet. In fact, if you are suggesting that this is Angel making decisions for people again, I would have to completely disagree. If Angel had have told Buffy about Spike being alive, THAT would have been making decisions for people. He would have been making the decision for Spike, when the ball was entirely in his court. So, no, Angel should absolutely not have intervened in this instance, regardless of how much he cared for Buffy.
I don't think Spike would have jumped at the chance to tell her had the situation been reversed, either.
Angel cannot be blamed for Spike's misgivings in not alerting Buffy herself. Angel is not to blame for why there hasn't been a Spuffy reconciliation yet, Spike is.
(Somehow, I just knew that the "nothing to do with him" argument would come up)
Interfering in things that have nothing to do with him when it comes to Buffy seems to be Angel's favorite pastime. from his initial decision to come to Sunnydale in the first place to his decision to have a detective follow the Slayer around in Rome. If lurking was a martial art, Angel would have his black belt by now. (I know, Spike did some lurking to, primarily in Seasons 4 and 5, but I would award him only a green belt). The only difference here is that he would be reuniting her with someone who she cared about, but he personally hated, kind of like his and Spike's attempt to separate who they thought was Buffy and someone who they both hated, for her own good, of course.
As for the "reason why Spike didn't tell her," I seem to recall expressing concern for Buffy and an attempt to go and find her as being the first things that Spike tried to do when he reappeared in Angel's office. The reason that you cite didn't come til several episodes later.
Angel hated Spike. Of that there can be little argument. But he has been making decisions that concern him for as long as Spike has been a vampire. He loved Buffy. There's no argument there. If he knew, as he almost certainly did, that she was mourning all of the casualties from Sunnydale, he would no doubt have also known that finding out that one of the ones whose death she felt responsible for was, in fact, not dead (or as "not dead" as a vampire could possibly be) would have eased at least a part of her pain. That's not interfering, that's being a friend. Also, that's exactly the same thing that he did by returning to Sunnydale when Joyce died. That had nothing to do with him either. Arguably, Joyce didn't even like Angel, or, if she did, she liked Spike more (she never fixed hot chocolate with little mushrooms for Angel [That's a joke, Flan, you can laugh now])
Telling Buffy that Spike had returned would be no different than trying to give comfort to her when her mother died. If one is what a friend would do, then so would the other.
To put it on a more personal note, I lost good friends in Southeast Asia, one of whom was never accounted for. If he were to have been found, I would most certainly consider it the obligation of whoever found him to notify his family and friends. Now, you might argue that the notification of the discovery of a dead soldier's remains and the notification that someone who had been given up for dead and has suddenly returned are two different things, but I can see no difference at all.
