I am not a personnelist, but this is how I understand it, and have seen it.
The PTDY rule in your attached image only applies if you take your 10 days of "house hunting" leave before you final-out your loosing PDS.
Example: You are stationed at Ramstein, you have orders to Langly, you choose to use your 10 days of "house hunting" leave before you pack-up and move to Langly, your current CC at Ramstein approves your PTDY to go house hunting, you leave the local area of Ramstein to take your 10 days, you return to Ramestein and sign back in with your current unit...
Now, if don't exercise the option above, once you final-out your loosing PDS you begin your authorized travel days on your orders. You arrive to your new unit, sign-in, and the CSS or CC clears you off for your 10 days house hunting leave. Because you have signed in to your new PDS and you are no longer leaving the local area to conduct your house hunting there is no action required in LeaveWeb, and the rule you reference no longer applies
Addressing your statement, "Anything wrong with moving OS to CONUS where I show up at my base living in TLF, take my 10 days PTDY (already approved by my losing cc) then BEFORE signing in, I take 2 weeks leave, sign in after which is still well before my RNLT?"
Kind of a grey area where its probably best to get a sanity check with the gaining unit. If you are trying to leave the local area of your new PDS while using the 10 days of house hunting than your plan is probably not Kosher. If anything, count the two weeks of normal leave you want to use in-between signing-out and signing-in PDSs. Then formally sign-in and begin your 10 days.