I think this is entirely political and would disagree it's a tacit admission of the F-35's shortcomings. I think the answer will be once again, no. Too much to re-generate production for what you will get. LM hire and fire all the time and I suspect a lot of the expertise and workforce is now long-gone elsewhere. Diminished Manufacturing Resources all play into this too so it would perhaps be a new standard compared to those jets in current service.
This leads me to conclude that this is all about congressmen getting facts to voters within their state who have been calling for more F-22 due to the negative perceptions of the F-35. I think the HASC are asking the USAF to go back and show clear working to the answer they already know or suspect they know. The F-35 is vital to the USAF and its synergy with F-22 equally so.
I'd also doubt any further F-22s built would be available to foreign buyers but they've been ironing out hose wrinkles in the F-35 Program for years, so you never know!