Oh, if it is a new plan sponsored by a new company, they can probably exclude the employees until they have a year of service with the new company. Don't have to count service with a prior employer.
What they CANNOT do is count service with the prior company for the new owner but not for everyone else. So if everyone else has to wait a year to become participants in what is (presumably) intended to be a qualified plan, there is no possibility of the new owner not also having to wait a year. NONE.