If it helps, the P9010 is a upgrade from the P9000 movement. Here is its disassembly of the P9000 and you can see the lever that stops the movement halfway down the page under the “gear train”. Pretty standard feature. I have a lot of experience with the P.9010 and movements in general. The P.9010 is the best in-house movement Panerai has ever produce to date with its design and features. There is no reason this hacking lever would ever be removed other than a completely different movement is being used. The notification with the finishing being changed sends up flags it might be a Frankenstein piece together movement using outsourced parts to create a P9010 like clone. Absolutely bizarre unless this might be a temporary fix to a Covid parts shortage. The P.9010 has been out awhile now and is well established and reliable so there is no major deficiencies that needs addressed.
The P9010 is used in the top flagship Panerai models. You can tinker with the entry level watches but this would be Panerai voluntarily committing brand suicide.
https://watchesbysjx.com/2014/09/exp...-together.html
This will give you some info between the P.9000 and P.9010.
https://monochrome-watches.com/intro...ays-automatic/