No, it is a permanent, hard delete. I am afraid there is nothing you can do.
It is mentioned near the bottom of https://help.trello.com/article/801-deleting-a-board but I think it should be far more strongly emphasised!
Nope ... afraid that ships gone.
Bit like they final words you were going to tell granny on the next visit, but she died, its like that.
Get into the habit of duplicating the board in your workspace, or in another you invite to the board, like firstname.lastname@example.org and use that ID just for this ... duplicate and rename wiht BAK 20201009-0024 to reflect the date/time of backup.
Then, at least you have something.
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