@AbrahamT K this is definitely a bug. I create a new tax return and stated the llc formed in 2019 and then I was able to go directly to deduction and see the startup cost entry. I was able to enter the cost and back date it back to the date I formed the LLC. Then I removed the start up cost entry and save it and then I get that msg again ( the topic does not apply to you since you indicated that 2022 is not your first tax year).
Once you remove it, you can't add it back w/o having to create a brand new tax return. ðŸ˜
