HTX 115 ?
Looks fine on the spec sheet, it'd be fine in use.
Exceeds the equilibrium dry and wet reflux boiling points of U.S. FMVS standard Nr. 116 DOT5.1
High protection against vapor lock phenomenon.
Excellent corrosion protection and rubber seal compatibility.
If it meets the DOT5.1 spec, great. 5.1 has the performance of DOT5 while made from the same basic chemistry as DOT3, etc.
Some racing brake fluids might not have a good wet boiling point. They're designed to have a very high dry boiling point, then get changed very frequently, likely every race.