The high cost of enforcing a plant patent is one reason many breeders do not bother with them (the other being the costs of patenting in the first place).
The best way to prove that someone has propagated your plant without permission is to compare it to a voucher specimen. This requires keeping bits of your plant in freezer storage with a third party, a very expensive proposition.
My crystal ball says this company has a technology that may turn that situation around:
My prediction is that some upstart company will disrupt the voucher specimen business using this technology, lowering costs to growers and thus improving prospects that they will take a chance on introducing your new rose hybrid.