A shark that eats grass?

[Catherine]

It looks like we are going to have to rethink sharks some more. They have found a shark species that eats sea grasses.

https://www.cbc.ca/news/technology/bonne...-1.4814092


The idea we have of sharks is that they are totally meat eaters. Now it seems that Bonnethead sharks eat sea grasses. They have the right enzymes to digest the grasses.
If that is true then what do we know about other shark species. Can they digest plants and do they ever eat them.
I hope someone is studying this. Maybe we have misunderstood them all along.