Refusing work could make him ineligible for benefits.

I suggest that he confirm, in writing, to his employer (and the super) that the employer stated that he was not fired but was offered a reduction in hours and that he accepts that reduction in hours.

He should send the letter signature return receipt to the employer's office and to the super and also hand a copy of the letter to the super in the presence of a witness, preferably one who will photograph him handing over the letter. He should make sure he keeps a copy.

Then, next week, immediately after his last full time day, he files for unemployment (or partial unemployment) based on the substantial reduction in pay.

While all that is going on he should be looking for another job as they will figure out a way to fire him at some point.