I doubt there has been any contact, but I suspect all colleges are doing "due diligence". It would be irresponsible not to. I believe it is very unlikely any ACC team goes anywhere in the next few years.
This SEC expansion is all about $$. The $$ is just not there for any ACC team including Clemson. Only way would be if the ACC walked away from the well written contracts and that is not going to happen. Since Maryland, things tighten up $$ wise considerably.
I am not a conference fan, I am a Clemson fan. We have been competitive with half the $$ Texas and some bring in. More $$ is usually a good thing, but I don't think it is available right now. The NIL is likely to have more impact on us than expansion.