Looks like the haptics connector bracket on the right button board according to iFixit:

https://www.ifixit.com/Guide/Steam+Deck+Right+Button+Board+Replacement/148943

"Exercise caution when lifting this connector—pry up on the connector itself, not its housing.

Use the pointed end of a spudger to lift up on the haptics cable to disconnect it.

Alternatively, you can leave the haptics connected to the button board and flip the board up and over the edge of the shell and out of the way."

Lots of comments along the lines of:

"Please remove this step. It is virtually impossible to remove this without breaking the housing and it's ultimately not necessary."

Looks like replacing the board as a whole is around $141.

Yo delete the pics of your fingerprint lol

That's almost certainly a 7FA

The one that you have appears to be intact

I’d be curious to know if it’s the solder joints that failed (less common) or if the pads ripped out of the PCB, which is usually what happens in these cases.

In the latter case, you’re going to have a hard time installing the replacement part. You’ll need to first restore the pads, which falls into “microsoldering” territory that will have a higher tool and skill / precision requirement.

now im no expert but that there looks like a circuit board