This was announced in March hearing. You need to do your summary again. Look at the details and not journalist thoughts. It has 50 to build, before TR3. They aren't being built in a month. I also saw that they also have the option to install TR2 and swap later
"Lockheed Martin said in an email to Defense News that it is too early to say how many fighters might be affected, and the company did not say how many F-35s with TR-3 hardware it expects to build this year. The company originally planned to deliver between 147 and 153 total fighters in 2023.
Lockheed on Monday said that it has so far delivered more than 45 F-35s this year, with about 50 more TR-2 F-35s now under construction."