GSW probably isn't winning 70 and Houston may win 55 instead of 58, but those seem like arguments around the margins. The Jazz have already been mentioned, OKC was explained. The Clippers at 50 seems pretty high to me but I'm Jon Snow when it comes to Teodosic. I could buy NO winning 50... I could also easily see them winning 30-35. Milwaukee may win a few less games because it probably doesn't take Jabari's injury into play? Minnesota has the talent to win 50 games, Denver should be considerably better as well.
The West will be really fun this year. Denver, Minnesota and Portland should all continue to improve and make the playoffs. But that means 2 teams that made it last year aren't. Jazz, Clippers, Memphis...
Speaking of the Grizzlies, that's a drastic fall, and probably accurate. That 2019 pick could very well be a late lottery pick for the Celtics or even a top 5 pick in 2021.
As for the other projected lottery teams, I'm not even sure the projections mean much other than they are terrible teams. The Bulls, Nets, and Hawks should all be terrible while the Lakers, Suns, Kings, Magic, etc. at least have legit prospects. Those teams with prospects tend to win games in late March/Early April. We saw it with the Suns and Lakers this year.