Someone posted the podcast a few days ago. If you listen to it, the part where he says he loves playing in the TD Garden is very tongue in cheek and after Simmons has already brought up the celtics multiple times, discussed trades with him, and subtly recruited him. Simmons laughs when he says that and says something to the effect of "now you're just pulling my leg".
Not to say it's an outright lie and he doesn't like the T.D Garden, I just think it's important to put it in context.The part about thinking he was going to get drafted by the Celtics was legit though.