There is absolutely not enough evidence from this particular doctor to justify the claim. It's irresponsible to publish this.
So the evidence is definitely not from only „this particular doctor“, but from a group of experts on the matter.
So are they claiming that this is actually due to the vaccine formulation itself, i.e. does this finding exclude the initial hypothesis of a Quality issue or a specific 'bad batch' of the vaccine?
Personally, if 3 health workers all go to the same hospital in a remote region complaining of clots, it's more likely that something local happened (as you say, QA, or any number of other sources).
Again, this is such a small sample and out-there group that it's not representative and there are many explanations that are more likely than "the vaccine causes blood clots".
"""Calculating further, he said, roughly 1 percent of the 1,000 to 2,000 daily blood clots — 10 to 20 a day — would occur in the vaccinated patients just as part of the normal background rates, not related to the vaccine.
“Only if epidemiological data show that that rate is higher, would one start to wonder about a causative relationship,” Dr. Moll said.
"""
AKA, base rate fallacy strikes again.