[This is what Obstruction looks like]
Yes it is. There should be people in prison just for this obstruction.
Sounds like the latest swamp creature trick to conceal evidence — hand it over to a Presidential Library.
And even then, you may have to jump through hoops after the five years are up, and you can still be denied access to documents.
You can then go to court (if you have the money and the time).
But when the swamp creatures are determined to hide something, they won’t give it up without a massive (and expensive) fight.