It's all BULLSHIT........NOT true, FAKE NEWS....insurer's write check on demand accounts....money gets moved around to the accounts as it's needed...The bank that is saying there are no funds are likely IDIOTS and just want them to look bad. Such a NON Story....ANY check for 900K gets put on hold.
Like @Realbadlarry stated, could be bogus...they probably called to see if there were funds before depositing the check and it would come back insufficient funds.
I did business with a guy like that after I called on a check, he gave me to see if it was good. He said that money gets transferred over to clear the check so he doesn't have to keep large amounts in his regular account.
Probably something like that with insurance companies...??????