Michael Cox did an article on this in The Athletic a few months ago. Iirc, all of the ‘Big 6’ record scorers were in the 21st century with the exception of Liverpool. But for the other 86 teams in the league, all of the record scorers were pre-2000, with the exception of clubs like Salford and AFC Wimbledon that don’t have that history.
The reason was basically that these days if a striker from a club outside Premier League, or even bottom half of the league, starts getting a few goals such that they might break their club’s record, one of the big boys buys them and it never happens.
Michael Cox did an article on this in The Athletic a few months ago. Iirc, all of the ‘Big 6’ record scorers were in the 21st century with the exception of Liverpool. But for the other 86 teams in the league, all of the record scorers were pre-2000, with the exception of clubs like Salford and AFC Wimbledon that don’t have that history. The reason was basically that these days if a striker from a club outside Premier League, or even bottom half of the league, starts getting a few goals such that they might break their club’s record, one of the big boys buys them and it never happens.