Venantsyo
GOLD
that is correct but there is an easy way around it (that is used frequently). Roster your higher level players to the lower level team official roster; then they can play up every week for the higher level team and on occasion when the lower level team need or want them, they are effectively not playing 'down'.
While this is technically true, I'd venture to say that the guesting-down issue in CSL is probably 1/1000th of what it currently is in SCDSL. Particularly because the up/down guest option was one of the staple ideas at the base of the foundation of SCDSL. It is clearly a rule designed by and for big Clubs with multiple teams for each age group as well as multiple franchises.