The answer is in the article:

If you’re getting income support payments such as the age pension and own a cryptocurrency, you need to let Services Australia know within 14 days if there is a significant change in the asset value.

Further if you are trading crypto with the intent to make a profit, you may be considered as self-employed (still working) and this could affect your pension.

Frankly, I’m impressed that the ATO is across Crypto enough to have such policies regarding it.