Well yes, you are correct in that at points in the past he wanted to. But I honestly felt that in 2020, he either thought his time for it had passed, or he wasn’t confident he was the best candidate to win. He mulled running for quite a while, and only really entered definitely when it was obvious there was really no other choice left for the DNC. But for a long time (too long really) nobody was even sure that he would run.

Not surprising, this is pretty much why he ran 4 years ago. He never wanted to be president, but his party had literally nobody (whom they would allow) that could step up and be a real contender.