Quite possible. I thought I had heard of a similar no contact clause being invalidated by the league some time ago. And it may be in regards to this part of the tampering rule-
"... inquiring club is prepared to offer a position as a high-level employee (doesn't get much higher than General Manager, I would say) . . . the employer club may not deny the employee the opportunity to discuss and accept such employment."
Evidently Robert Kraft and Cal McNair talked, no discussions/no trades/no tampering charges.
But Caserio's contract with the Patriots is ending immediately following the 2020 draft. It's possible the Texans might go 2019 without a true GM. This could get interesting.