There is still a desire within USAF and a chance that the engineering and development process will go faster this time around. That's what USAF was focusing on for the last decade or so.
First flight before end of Trump s term was announced as a plan. It may or may not happen but it's possible. That would be very start of 2029.
Furthermore, maybe this time original development time lines for f35 might happen. For example, back in 2006 usmc f35 was planned to reach ioc in 2012, with USAF version in 2013. Those were as we know 3 years late.
But if they are not late this time around and if first flight is indeed at the start of 2029 then sometime in 2036 is possible for the ioc.
Sure, there are many reasons why that Might not happen but keep in mind US dod views China as the biggest threat since basically early cold war. It may be inclined to do whatever it takes to expedite the f-47. Including throwing piles of money at it, cutting development corners, lowering ioc requirements and accepting a more risky development, even including crashes and accidents if it means getting the plane in service a few years earlier. For USAF, it may be a matter of life and death.