Lithium-ion polymer battery.
Rebuilding not worth it IMO, plenty of nice portable chargers currently on the market with improved input and output options, many of them also features Lithium polymer cells but with newer tech they don’t swell as easily. I had my Xiaomi 20,000 pro 45W for the same amount of time and it has been stored full for months, no sign of swelling.
However I still much prefer cylindrical cell powerbanks, my first gen Xiaomi died long time ago but the pulled LG 18650F1 cells still run fine.
my 20000mah 2C has started to bulge too, less than the OP and it’s only noticable because it spins on a desk and doesn’t sit flat, you can see it against a straight edge. it’s old but I’ve barely used it!
is this expected from all pouch cell power banks eventually?
Yes.
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Hello, the battery of my PLM05ZM device is swollen. How healthy would it be to power this powerbank with a few 18650 li-ion batteries?