There are two “dust” thresholds, which can get a little confusing.

There is a dust payout threshold, which requires at least 0.02 worth of payout on a post/comment in order to receive a reward. (If the payout is less, it gets rounded down to zero.) This will be unaffected by the changes being proposed.

There is also a dust vote threshold, which is a minimum restriction on the size of votes that are allowed. This is what is changing, as described in the post.