You can't make a sure case that either of those are singular.
Your example from Gen 9:26 and Gen 9:27 וִיהִי כְנַעַן, עֶבֶד לָמוֹ (Canaan is not just a person but a nation).
Deuteronomy 33:2 is plural. "a fiery law unto them.".
great examples, thanksstevenmiller wrote: I don't see a single entity as group in
Job 3:14; 6:19; 14:21; 22:17
would there be many examples of Lahem that aren't relating to people?stevenmiller wrote: Just looking at a lot, but not all of the uses, I theorize that lamo means something like its sound-alike לעמו "to/for his people" or "to/for his/their extended people/group"
perhaps we should consider how often lahem is used for "those objects"!