Cashed out an inherited Roth IRA from parent. box 2a on 1099-R is blank and box 2b is checked. box 4 is 0.00 and box 7 is T. Is the distribution taxable?

Parent passed away in 2014 and I cashed out in 2019. I'm not sure for certain when the parent originally opened the account.

Similar to the question already answered here:

https://ttlc.intuit.com/community/retirement/discussion/we-cashed-out-an-inherited-roth-ira-from-fat...

only difference is I have code T instead of Q.