Some background on the AoB album, as I understand it.
Bruce said that the whole Accident record was an Accident. He had planned Skunkworks to be his future musical direction and his future band. Before Accident, he used to say 'never metal again' and 'never Iron Maiden again'. Then Skunkworks was a gigantic flop. He thought his musical career was over (that's what Man of Sorrows is at least partly about -- yeah I know it's also about Crowley and he'd originally written it before, blah... it's still about that). He was in a desperate mood (he said somewhere that his wife urged him to do something about it already), when Roy called him up and told him he'd written some riffs that would be perfect for Bruce, and that they were metal. Roy was the whole driving force behind the album, according to Bruce. So Bruce thought, what do I have to lose, went to a LA and Roy's stuff felt great. So: nothing was planned, the whole album came as an accident.
After the release of Skunkworks, when the album was a flop, when they had to go on tour supporting Helloween, when life felt shitty for Bruce anyway, his mother told him that she had tried to get rid of him during pregnancy, but that the abortion somehow hadn't worked out. It made Bruce's crisis perfect. He was a failed abortion: an accident of birth.
So the album's title is about the accident of Bruce's birth as well as the birth of the album itself. The title track is about that, and about Bruce's whole situation during that time. You could say the people who welcome him home are his mother as well as the metal community. It's like, yeah, I'm here, but who gives a fuck. I'm 'at home' doing metal, which I've never wanted to do again, why am I even born.
When it came out, I had very mixed feelings. It felt like he'd given up, like he tried to hold on to the past, like he tried to be successful by doing everything he actually didn't want to do. Songs like Magician seemed almost Hammerfall-ish. The cover was a puppet called 'Edison'. No band pictures, only Bruce and Adrian, even if Roy was way more important. It took some time for me to realize that, given the circumstances, it was quite an honest record with good songs, and that Bruce's voice was actually better than anytime before.
Sorry if I'm tl;dr.