Several things happened here. Your mg42 was not in cover. The maxim ran into a crater and thus received yellow cover in all directions. Your mg42 pinned it around the 24 second mark but then had to reload. The models of your mg42 were all behind your mg42 and thus let combat status drop from the maxim; which let it get very fast suppression recovery during the mg42 reload.
Maxim was in cover while suppressed, firing at an mg42 in open cover. It then suppressed your mg42, however it got pinned again eventually.
This is not a good demonstration of mg42s lack of pinning.
Since there's a lack of videos showing an mg42 doing its job, I present to you this:
if you look closely my HMG42, it does have yellow cover too
but your video is a demonstration of what i mention that infantry is under pin even move away from HMG fire but stay in pin because they are under fire of other infantry