Raymond Wiker wrote:

Since when was not "labelled" a correct, alternative spelling
of "labeled"?

Ever since label was spelled label and not labelled: la-bel la-bel-ed

Oh! Maybe your extra "l" is a lisp thing?

You're hopefully just pulling my leg... but if not, I
suggest you consult a dictionary.

Uh, OK.

la·bel /ˈleɪbəl/ Pronunciation Key - [ley-buhl] noun, verb, -beled, -bel·ing
or (especially British) -belled, -bel·ling.