Part Number: THS4521
When searching Fully-Differential amplifiers here https://www.ti.com/amplifier-circuit/op-amps/high-speed/products.html#p512=120;7000
The web-server fails to find a lot of components with corresponding filters enabled.
For instance, in the list above, you can find THS4521, a fully-differential rail-to-rail amplifier.
But then enabling "Fully-differential" switch either in "technology" or in "feature", it will not be in the list.
Probably, there is an inconsistency in the database.