I would second this. Had mottling on 2020 exp Delta 120 that developed in the 2.5 years after it expired, no problems in 2021 shoot and developed roll, notable mottling in 2022. Film was room stored since I bought the rolls in 2019. As lower temperature slows chemical reactions, it might also help out with the offset with current film.
About the 2 year expiration date, interestingly I have seen 3+ year expiration for 35mm Kentmere 100, whereas the dates are shorter with 120 and Delta (specifically 3200 for sensitivity reasons). I would wager that despite the tighter regulations (35mm) ISO 400 and lower B&W film still keeps quite well past the 2 year dates. Caveat for the backing paper in 120; But I had no issues with 1-2 year expired HP5 and Delta 400.
Delta 3200 will fog with age due to sensitivity.
Ilford themselves seem to sell film directly off their website. I recently read a user mentioning them having a "hidden" black friday sale with 10-15% discounts off their website.