Because I'm a sucker for this kind of stuff, I did some digging and can confirm a few things.

First time OSU has ever beaten three top-10 teams by 20+ in the same season.

First time OSU has ever beaten multiple top-5 teams by 20+ in the same season.

First time OSU has beaten four top-10 teams in the same season (came very close in 1998 -- Penn State and Texas A&M were top-10, while West Virginia and Michigan were both ranked #11)

Only the third time that OSU has beaten three top-5 teams in the same season (1968 and 1996 being the others)

Obviously we have a chance to add to these.  But what it shows is that this team has faced a very top-heavy schedule and has absolutely dominated some really good teams -- perhaps more so than any team in OSU history.