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This is an interesting native speaker mistake. I'm pretty sure it's not a typo.

It makes sense:

• plum (= fruit like a purple apricot🍑) has a short 'uh' sound.

But to keep the short 'uh' sound, you need to double the final consonant, as in Christopher Plummer (actor):

When you add an 'e' without the 'mm', you get 'PLUME' 🪶 (rhymes with 'room'), so 'plumer' sounds like 'ploomer'.

I'm sure you already know that the correct spelling is PLUMBER. 🪠 (silent 'b').

Why is there a 'b' in the spelling?

The word "plumber" dates from the Roman Empire. Lead was used for piping and for baths, and the Latin word for lead is plumbum (hence the chemical symbol for lead, Pb).