I wouldn't be so quick, Hyundai has been in talks and shown interest in the LMH ruleset since the beginning. There were also frequent rumours about a DPi (IMSA, LMDh predecessor) entry. And although postponed, the future hydrogen class in the WEC was known to be of interest, or in other words a Hyundai entry from 2025 onwards was all but confirmed.

My most reliable sources/sites didn't mention Hyundai in any capacity for maybe more than a year.

It's also worth noting that LMDh is laughably cheap as manus basically run customer cars from specialized chassis manufacturers, so both together would still work.