The phrase "are only deemed" is correct and usable in written English.
It can be used when discussing perceptions, judgments, or classifications that are limited to certain conditions or contexts.
Example: "In this study, certain behaviors are only deemed acceptable under specific circumstances."
Alternatives: "are merely considered" or "are simply regarded".
Stockbrokers are only deemed registered when they are employed by a member firm, and then have only 24 months to find subsequent employment or their registration expires.
If anything, it's insulting to your children that they are only deemed inspirational enough to inspire, say, a cost-keeping spreadsheet, or a complex HR form to request new and less brittle plastic yogurt spoons.
However, these studies sparked intense debate as they clearly violated the condition of equipoise: that placebo groups are only deemed ethical if there exists sufficient uncertainty regarding the merit of the intervention.
In fact, commercialisation is only deemed viable when microwave heating offers additional process-specific advantages over conventional methods of heating.
Almost to a man and a woman, every journalist I've spoken with inside BBC Scotland says what amounts to the same thing: BBC Scotland is only deemed to be important if it makes programmes for the network.
To help such future personages who incur some pesky grief, here is what not to do when you're going through the motions: a) Don't suggest that what you've done is only deemed wrong because it falls outside some kind of arbitrary code.
The industrial ELN was unfavourably described, whilst the other ELNS were only deemed useful for certain purposes.
Diogo Dalot's shot hit Presnel Kimpembe's arm but was only deemed a spot-kick after the VAR intervention.
Conte opted to keep striker Michy Batshuayi on the bench, while top scorer Alvaro Morata - who has been watching videos of club legend Didier Drogba's goals for the Blues - was only deemed fit enough to also sit among the substitutes.
Additionally, the weapon design was simple enough that it was only deemed necessary to do laboratory tests with the gun-type assembly.
The pipeline is only deemed insignificant because the State Department's report failed to fully consider the ways the pipeline would affect production of the tar sands, the group argues.
