Asbestos? In plaster?
sent them some pictures over text... they said this is 99% asbestos...

Immediately throw away the phone number and email address of this company because what they told you is poppycock. Without a lab analysis nobody can say whether or not that plaster contains asbestos, and certainly not what percent/volume or weight.
I have met insulation specialists, who work with various legacy materials on a daily basis, who have correctly predicted materials that were ACM (asbestos containing materials) but they will never wager on it and they certainly can't analyze content percentage by sight/feel/touch/smell/taste... it requires lab analysis.
While I agree with a comment that advised minimizing exposure, I disagree with a comparison to radiation. Asbestos is never acutely hazardous (as some types of radiation exposure are), but rather a chronic issue. In fact, the chief concern with asbestos is with repeated occupational exposure.