No, it would still just be the top 4. However if Arsenal were to win it and finish outside the top 4, they and the top 3 would qualify, leaving Europa League for the 4th placed team.
I'm sure fans running on the pitch at Boro isn't going to stop the home fans doing the same against Cov on the last day. Also, doubt many will be thinking 'if we run on now, people might not run on next week' during the hysteria after the game on Saturday if we go up.
Brighton fans ran on the pitch at Walsall last season.
Newcastle fans ran on the pitch at Plymouth the season they went up.
Portsmouth fans ran on the pitch after clinching survival at Wigan a fair few seasons ago.
Etc.
He's a bit of a knob. Same guy who persisted with the whole 'Saints aren't really promoted yet', in some odd attempt to dampen everyone's spirits (impossible, I know) after the Plymouth match last season.