Yes, but they won't have done a risk assessment for it. As you will know, microbiologists are supposed to have risk assessments for precisely what they're doing

Yes, but they won't have done a risk assessment for it. As you will know, microbiologists are supposed to have risk assessments for precisely what they're doing; as you will also know, they are often pretty approximate about it; but in the case of work documented in a virally popular Twitter thread, it would probably be sensible to be seen following the rules.