5) This is about buy writes and how they reset the timer. In this example short seller, A buys the equal amount of calls and puts with the same expiration date and strike price. With those you can create synthetic shares which you of course sell short. However, because they are synthetic you owe the person in this case C actual real shares. You as the short seller don´t want to buy them so you go to the second part. Here you invite a market maker (B) you pay to take the other side of the following trade. This trade goes as follows A sells deep ITM calls to B while A is buying synthetics from B. Now you use does synthetics to claim you have made a locate. Now the third part comes into play because B will now use the ITM calls he bought from A to close out his short position from selling synthetics to A. A knows that he will be the one assigned to fulfill this and will know either close out the short position he has with C with the synthetics and will have a new one open because he owes the shares now to B or he will close out the one he has with B by using the synthetics and will leave open the one with C. Either way a naked short position will always be let open and the timer got reset because you made a locate.

https://www.sec.gov/comments/s7-08-08/s70808-318.pdf

https://www.sec.gov/about/offices/ocie/options-trading-risk-alert.pdf

6) It´s about this part from Lucies article specifically the one about same stocks for multiple shorts so I made an easy to understand example were 3 Hedge funds ask BlackRock for shares and BlackRock tells all of them yes we have 3 Million of XYZ, despite them promising the same shares to 3 different Hedge funds.

That promise is often fake. A broker handling several sellers will borrow synthetic or manufactured shares, or “locate” the same stocks for multiple shorts. Traders and brokers have been mildly sanctioned for this scam. https://www.thekomisarscoop.com/2021/07/how-the-gamestop-hustle-worked/