The topic ST MP series, though also made by Champ Labs is not an ACDelco and makes no claim of the black adbv being same as the latter. As such, I can't make that leap.
To topic, how would it make sense for the MP black adbv to be black "silicone" now because of stated supply chain issues. It would seem logical imo, that shortage is in the material for adbv, silicone. Also, the ST series uses black nitrile adbv.
Using KISS here, want (and paying for) silicone adbv on an MP series, look for original blue or orange.