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Re:January 1, 2023 is Public Domain Day: Works from 1927 are... by chii on Tuesday December 20, 2022 @10:28PM (#34076293)
but the copyright to that code would expire in another X number of years.

So it's equivalent to having GPL on that private fork, but on the timeframe of copyright expiry.

Re:January 1, 2023 is Public Domain Day: Works from 1927 are... by Scarblac on Wednesday December 21, 2022 @12:14AM (#34076937)
No. The GPL says you must provide the source when asked. In the new situation they would just never distribute it.