The original articles said the 2.0 L was only supposed to be eliminated for 2021 with a different 2.0L planned for 2022 and later. Then Covid hit.
Depending on which article you read, the 2.0L was only selected between 8% and 12% of the time. Switching to a single engine greatly simplifies the production and support tasks. Less training, less versions of sales materials, less owner and tech manual changes, less parts to stock, etc.
And you'll still keep 90% of the buyers happy. Even if GM has a customer like you and me who preferred the 2.0L, as you noted, GM just may still get the sale but just with a different model.