R’ Shlomo Zalman Auerbach zt”l had a teshuva on the topic of shmita and heter mechira. The question was if someone held of the heter had a guest who didn’t hold the heter worked, was it a problem for the guest to eat the food? He says that as long as the host has a good posek to rely on, it is fine for anyone to eat at his home.
You may remember that a while back, I had a thread about kashering a dishwasher. When I asked the Rav in the area I moved to about it (after I’d gotten the heter about kashering it from the Rav in my previous hometown), he quoted this teshuva and said anyone could eat at my home.
I believe the same teshuva would apply to this situation. R’ Schachter and R’ Willig are definitely people we could rely on.