The dogma around vegetarianism/veganism is absurd.
Someone who never eats meat and who eats meat a few times a year are nearly indistinguishable compared to someone who eats meat every day.
The purity tests are childish. Eating meat on rare occasions doesn’t make you not a vegetarian.
To your point, I have no idea and I would give little stock to someone who would actually care. You’ve almost certainly eaten some insects in your produce in your lifetime, does that mean it wasn’t vegetarian?