The industrial conglomerate RPM International has been a long-time owner of Rustoleum. And Rustoleum has been a long-time owner of the Testors/Model Master product line.
This is not a new story. Rustoleum has a long history of owning and discarding hobby paint lines. RPM/Rustoleum used to own Floquil, one of the best paints I ever used. Discarded. Rustoleum used to own Polly-scale, one of the better early acrylics. Discarded. Did'ja ever hear of the Testors Color by Boyd line of auto model paints, matching colors of Boyd Coddington? Discarded.
Lament what was and move on. There are now better products available