No. It doesn't round up. If you use the CEE link and put Bryant in the brand name box and 915S in model number box, you'll get a list of Bryant models 915S. Scroll over to the CEE Tier Column and see that none are Tier 3; confirming it does not round up.
I remind you this is 2023 standards. For 2022 installs + 95 AFUE was the furnace standard. Here is link to the 2022 requirements.
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