This is similar to How to correct a passport stamp in the UK?
In my opinion it is not a big issue particularly because everyone knows nothing exists like 32nd November and furthermore it is in their database in which nothing like 32nd November can be coded.
He can get it corrected at an international airport or port of entry.
At Heathrow (and I assume for other ports of entry) a few years ago when my lost baggage was found, I was asked to return to the airport where there’s a telephone you can use to call immigration and they will come and get you and take you back into the immigration area where this mistake can be corrected.
You can also use [email protected] or [email protected] to contact them like I did on a different matter. They do respond quite promptly.
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