It’s not goalpost moving - it’s fact. One that conveniently blows the argument up.
You can find great players in every round for every position. It’s not restricted to one position group more than any other.
You’re making a point nobody is arguing (that i.e. you can find examples of good players at any position in any round) and treating it like you said something profound.
You can find quality, starting-caliber, and productive RBs at later points in the draft and even off the streets, moreso than any other position.
We can go down the list of 1,000+ yard rushers the past 10 years if you’d like?
Responding back with “we’ll how many are HOFers...” neither addresses nor dismisses the claim, but rather misses the point entirely.
It’s like saying you can find a good burger at 12 different burger spots by my house, but then someone responding back and sayin “oh yeah, but how many of those burger joints are Michelin Star rated restaurants?”