If you go to NBA.com I believe they have updated all heights to show their true height without shoes. Tatum is still listed as 6'8" suggesting that he either grew a little or should have previously been listed as either 6"9" or possibly even 6"10 in shoes depending on actual height and rounding.
I actually don't think they are all the new heights. There are definitely a few that are the new listed heights, but some are still the old ones. It is honestly still a crap shoot. NBA.com lists Bagley at 6'11, at USA camp right before he was drafted he was measured as 6' 9.5 without shoes, and the Kings announced him as 6'8 at their preseason game.
Another example of the variance is that reports were Tatum measured at 6'8.5 without shoes, hes listed at 6'8. Lebron also measured at 6'8.5, hes listed at 6'9.