I would've expected 72 and 64. I don't see any options related to ECC in the BIOS. Maybe the upcoming 2.0 update will include that.
should be 72bits
DDR5 is 2x 32Bit
there are (if you trust the spec) ECC UDIMM with 2x 36(2x 4bit ECC) bit = 72Bit.
but DDR5 USIMM spec & kingston says 64 or 80 bit(ECC)