To summarize:
In soft fork 0.22.2
Steemit accounts (misterdelegation, steem, steemit, steemit2, and steemitadmin) can not vote directly from these accounts. But they can delegate steem power to other accounts (same as they were doing before in order to support different projects). So yes, in the end, this power is used indirectly to vote posts. (But take into account that if you restrict this then Steemit Inc will not be able to create new accounts with delegation), which is very important to welcome new people.
However, they can not vote for witnesses or proposals, and can not delegate this vote (can not set a proxy).
Finally, all operations like transfer, power up, power down, are not allowed.
In soft fork 0.22.3 (timcliff)
The restriction is only in voting for witnesses.
Vote for proposals are allowed, and all operations for vote posts, transfer, power down, etc. are also allowed.