(I read that "disk drill" do this)
Here is what Disk Drill has to say about their own product:
In reality, data recovery on Mac is mostly about luck!
When you delete from a HDD, the data remains until overwritten. That might be now or never.
When you delete from an SSD, the data remains until the Garbage Collection (or TRIM) routine runs and makes the bit available for writing, clearing the data stored there. The time it takes is dependent on the design of the SSD controller (or OS implementation of TRIM), but it should be fairly expedient.
I didn't know that, I am not an expert, that's why I asked,
It is always better to ask about the ultimate goal as opposed to asking about the solution you think will solve the problem.
Q: "I want to sell my Mac. How should I prepare it so the buyers can't recover my data?"
A: "If it isn't already encrypted, encrypt it. Erase the drive and reinstall macOS. See <link provided by Kjohko> for more things to do before selling or giving away your Mac."
As you noted, you have a T2 Mac, so it has always been encrypted whether you enabled FileVault or not.