The projected inflation for Hive for 2023 is 6.5%
From my estimates this number is incorrect. On January 1st of 2023 the print rate was 6.94%. That rate decreases by 0.01% every 250,000 blocks. This means that every year the inflation decreases by 0.42%, so by the end of 2023 it would be 6.52%. However, that emission rate only applies to the end of the year, not to the whole period.
The estimated inflation for 2023 would be the average from the start and the end of the year, which is 6.73%.
Yes that is exactly how it is. I have rounded it up to 6.5% for simplicity. Also when you calculate these things you need the period that have passed to end, to have a base and the addition (new inflation).