No, DPoS requires 2/3+1 majority for a rule change. The tweaks here were designed to allow a non-majority group to create a new chain which is what happened. On that new chain, the 2/3+1 DPoS rule is still in place (unless they wanted to create a new chain, etc).

For #2, it only impacts the accounts listed in the code there, but yes, the tokens were not burnt, they were sent to the proposal system which an be used for whatever the token holders agree to (such as development).