Yes, that is correct. According to Aoi, this Tomoyasu is the son of Tomonari (友成), who is supposed to have been the origin of the Ko Bizen school (c. 987). Which would place his son (Tomoyasu) around the 1000s (Kanko era, as indicated on the sayagaki). But this leads us down a little rabbit hole, as there is a divergence of opinion about Tomonari.
Anyway, without getting into those details, I can only repeat what Jussi says; a blade that appears to be from the early 1000s, that has a plausible signature from Tomoyasu, would be interesting from a historical perspective even if it were retempered. A real unicorn.