Statistically Goff has been better than Mahomes for the past 2 consecutive years. He's putting up damn near top-3 QB stats. I think calling him top-7 accounts for the "well he's obviously not on Mahomes' actual level" thing.
And at this point, I don't actually think Herbert is better than Goff. Herbert still is just basically potential and the occasional "wow he's got a cannon for an arm!" guy, but beyond that there's not much substance to love.
Mahomes, Allen, Burrow and Lamar I think are comfortably better, but I think Goff has solidifed himself in that next tier of "guys who we think should be elite but aren't really elite because they're not consistent enough"