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The other stuff seems a lot more tenuous, but I'll give you the fact that the donation records is hard evidence that there's Clinton support within Mueller's legal team.
But like, what's the consequence from this? Being biased doesn't mean that they're faking records or planting evidence- if they come up with a strong, evidence-based case, it shouldn't matter what their allegiances are since the evidence speaks for itself.
On a side note, I've read more about the guy who Mueller fired that worked on the Clinton investigation, and the memo that he edited was being sent out
after Comey's team had already decided they weren't going to press charges. The words 'gross negligence' were changed because that
does imply the need for prosecution, which wasn't the aim they were going for.