I find it funny how, despite having Adult Swim branding and being based on the show library known for being edgier overall, Checkered Past is going to be way more accessible to the shows' original target audiences than Nickelodeon's nostalgia blocks were given its after-school timeslot and TV-PG rating for interstitial content.
Not sure if after-school was the best choice, that's a big time for children's programming where you should be showing new episodes of major shows instead of a nostalgia block, but at the very least not being midnight means it won't eat into the existing Adult Swim block, and will allow these shows to be seen by their original demographics. Mid-school would probably be the best place IMO - in the UK, CN used to air nostalgic programming there in the early 2010s, it'd still appeal to a primarily adult audience, but it makes for special "exclusive" programming for kids when they're sick or if (like me at that time) their school provides TV during lunch breaks.
Those idents look pristine.