“Transaction fees going up forever” is different than “fees will be higher in the future permanently”.

The former is false, the later is likely true.

500k sats is unlikely to be operative dust, but it could cost a very high percentage of itself in fees to be moved.

You can read the article where that chart came from, and the math behind it, here:

https://unchained.com/blog/small-utxo-bitcoin-dust/