Maybe. I don't have enough context, but maybe that's what he wanted to do? Whatever you may think about it, I'm pretty convinced Ozzy wanted to go out with a big concert. Nobody had to push him to do it.
Even if he did... he was in bad shape and it must have been physically taxing.
The thought of him feeling obligated to be on stage in front of a room of wide-eyed adult children is particularly sad. This is more a commentary on his fans than Tim himself.
Others here are saying, like Ozzy, he might have been doing what he wanted to do.
To quote the poet, Dylan Thomas,
Do not go gentle into that good night, Old age should burn and rave at close of day; Rage, rage against the dying of the light.