Verified P&L link cannot be tampered with. When you click on that link, what you see as P&L is from our side. But of course, if someone shares a screenshot or video claiming to be the P&L of their verified P&L link, that can be tampered with.
A few say that a person can be trading with two accounts, generate profit from one and generate loss from another. Show the P&L of the profitable one. Such a strategy might work for shorter duration intervals, but it is almost impossible to game it for the longer duration P&L. It is hard to make profit and loss in respective accounts continuously.