Both Horvath and Steffen had well over 100 caps before they were loaned to a Championship squad (Luton/Coventry). As well, they had both had previous experience in Europe. Steffen Bunde and Prem, Horvath Belgium and Norway.
Hell Pickford started out being loaned out to non-competitive European Leagues.
And yes, the Belgian League on a whole is comparable to MLS, but the top teams are leaps better than the top MLS squads.
It's definitely not a homerun, but certainly much less risky than sending him to a squad that might not start him.
Btw top of the Belgian League vs Championship