The accounts have new owners, so history of voting or not voting is largely irrelevant towards the intentions of the new owners. What is relevant is that under the old ownership, there weren't incentives to act against the blockchain whereas with the new owner, it is less clear. Transactions that allowed for the creation and delegation of new accounts have not been impeded.
But it does limit the stake to only creating and delegating to new accounts. Were these the accounts that were powering down and doing programmatic selling of Steem for instance? Do we know that Justin Sun is now paying Steemit Inc. employees and operations out of pocket or could this move essentially shut off Steemit Inc. funding otherwise? I understand this is intended as temporary, but it still cuts out alot of legitimate use cases of funds "earmarked solely for the development of the Steem ecosystem" so real negotiations and hardforked governance changes need to happen soon.
That is the idea. This has been done by a community of witnesses to assert the blockchain's continuance, primarily by temporarily removing the potential for a single-party decision to hard fork.