The conclusions they draw about the Russian spies are so fundamentally basic that to question them would be a shocking assault on truth.

These spies used GRU HQ address on their undercover passports. They registered over 300 sequential vehicles all to spies. They used their real names! This wasn't a "Bellingcat isn't credible" situation but a "GRU failed at basic spycraft" situation.

The "questionable conclusions" on the first suspect have been confirmed by UK and US officials.

Well the Russian government seems to take them seriously enough that if I were them I'd buy a big life insurance policy and start being worried about polonium in my food if you catch my drift.