For those that run Element server and run postgresql version older than 13 will need to update their postgresql major version.
I found these instructions by 'maxkratz' on their github page which worked perfectly for me to go from 11 to 16.
Hopefully this helps someone!
Don't just pixelate, just straight up remove or cover it with a solid color.
Still unlikely, but there might be a way to reverse it. https://www.bleepingcomputer.com/news/security/researcher-reverses-redaction-extracts-words-from-pixelated-image/