I'm sure its a great record, and big congrats to them. They deserve it after all these years. Great band.
But one of the reason you are seeing high chart positions for these bands is foremost They are still making great records all these years later, and secondly, album sales are in the toilet for most of the market, so therefore you don't have to sell as many records to make a top list as you did 10 years ago.
And I believe you are seeing some of these great career Punk bands get high chart positions because fans of indie and punk music are one of the few "markets" where people are still into buying physical albums and or buying the whole digital album instead of simply buying singles off of albums.