It’s not just to fill out medical expenses, it’s to use TurboTax Deluxe Online, which includes the ability to enter medical expense, bank interest, and more.
The free version of TurboTax Online is only suitable for simple tax situations. This page shows what is included in a simple tax return and what is not: https://turbotax.intuit.ca/tax/filing/free
This change in how Free works was made for the 2021 tax year (last year), and 2022 is simply following that. The only difference is that the price of Deluxe has gone up a bit.
If you were 25 under or last year, you would have also been able to file for free, but that promotion is good for any version of TurboTax. So, even if you were upgraded it would have still been free.