Afaik it would compete with moly because they both want to form a tribofilm but other users know better than I do.
Probably OK in certain proportions and types of compounds used. I would wonder if the Rislone product might clash with whatever motor oil you're running. Fully formulated options, while rare, do exist:
Ravenol DXG dexos1 Gen2 5w30 oil has both tungsten and moly, so they are surface compatible in certain proportions anyway.
"For the developement of RAVENOL DXG SAE 5W-30 the proven formulation of tri-nuclear moly
and OFM (Organic Friction Modifiers) was used. A highly polar Group V base oil was used in this formula, which has good compatibility with the PAO used."-- Ravenol's website
Another German oil maker, LiquiMoly, has MotorProtect and MolyGen motor oil with tungsten:https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4638150/1