It looks like that design doesn't have a great big nut that secures the two parts of the propshaft in one place - interesting (!)...
At the start of your film it looks like the centre bearing support moves more than I would expect - but it is difficult to judge 'cos I don't know how hard you were pulling on it.
I can say that most of the W202 / W201 propshaft problems reported seem to be related to the UJ rather than the splines.
{On my 100,000 mile W201 the UJ has a distinct clang}
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