On a Linux, you can securely erase data or hide erasure after the fact by overwriting the affected location on disk with new data. This new data could for instance be all 0s or randomly generated numbers. There are several programs that can do this on Linux.
I always wondered how to do this on my Android phone without accidentally f*cking up my data because of how Android partitioning works. I mean... Have you seen an Android block device list? (This is NOT critique! Android's partitioning methodology is one of the reasons for it being so secure an OS, apart from process isolation/containerization. I think they call it "siloing"? Android devs/enthusiasts, please correct me!)
Then I discovered Extirpater. Check it out and let me know what you think! It was archived not too long ago.
https://gitlab.com/divested-mobile/extirpater