Aliasing on cartoons is not a defect of standard def videotape, not even VHS.
I don't know about those series, but both Shout! Factory and Mill Creek (moreso the latter) have released messed up versions of other series I've bought. In some cases they look worse than TV broadcasts I have recorded.
Here is one where the web streaming version is not aliased while the DVD is: http://www.tvpast.org/forum/toons-superheroes/19844-more-incompetent-dvd.html
Is your screenshot really from a DVD though? It looks like an encode where someone has added a heavy spatial noise reduction filter, smearing detail in addition to the aliasing problem.