No, because NSW “rules” can be changed by a simple majority at a general meeting whereas by-law changes require a 75 per cent majority.
If the condition is not created by a special resolution then it doesn’t need a special resolution to change it, and therefor is not a by-law.
The strata committee is often empowered to make decisions on behalf of the owners corproation. But the OC can undo the decisions at a subsequent general meeting.
Apologies to Victoria readers where “rules” is the term used for by-laws.