They may not be repurposable per se, but they are a great benchmark for what may be realistically achievable for cracking password hashes utilizing similar base algorithms.
AFAIK, the base algorithms here are custom-fabricated ASICs. If your adversary can custom-fab ASICs to break hashes in your PW manager password in PBKDF2-SHA256, no reason they couldn't make one in whatever harder algorithm you could come up with.
Someone using an FPGA or ASIC can dedicate almost all of the die to creating lots of SHA-256 units.