Yep, I used that e-mail about 2 months ago and got my reply last week for a 10 hr delay for EU 261 comp. Looks like if crew gets positive result then no 261 compensation.

"We refer to the e-mail addressed to Mrs. Christine Ourmières-Widener, CEO of TAP Air Portugal which received our utmost attention.

Please accept our sincerest apologies for the delay in our contact, as well as for the cancelation of flight TP242, from Chicago to Lisbon on the 3rd of July.

We would like to inform you that the cancelation, of the mentioned flight, was due to illness, a crew member tested positive to Covid-19 and consequently there is a mandatory quarantine of remaining crew, this could not have been avoided by TAP Air Portugal.

All efforts were taken in order to minimize the problems caused to our passengers and rerouting to your final destination was provided on the first available opportunity.

According to the European Regulation (EU) 261/2004, whereas 14, as under the Montreal Convention, obligations on operating air carriers should be limited or excluded in cases where an event has been caused by extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken.

Therefore, we shall inform that we cannot pay compensation in this case. "