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Discover LudwigThe phrase "are ostensibly" is correct and usable in written English.
It can be used when describing something that appears to be true or is stated to be true, but may not necessarily be the case.
Example: "The results of the study are ostensibly positive, but further investigation is needed to confirm their validity."
Alternatives: "seem to be" or "appear to be".
Dictionary
are ostensibly
adverb
Seemingly, apparently, on the surface
Exact(56)
And are they welcomed by those they are ostensibly helping?
All means of communication are ostensibly free of government censorship.
Although the Houthis are ostensibly making political demands, including cheaper fuel, the fighting has personal overtones.
In some Olympic events, athletes help each other, even though they are ostensibly competitors.
Many deals that are ostensibly American are now held up for months for Chinese regulatory approval.
They are ostensibly monogamous but have an "if you cheat, please don't tell me" rule.
"There are sentiments attached to memorials and these are ostensibly memorials to Dalit leaders.
Though the pages themselves are ostensibly unisex, the tone is frequently misogynistic.
Spies are not above deceiving one another, even when they are ostensibly on the same side.
In most of Roth's novels, people are ostensibly destroyed by their relation to the state.
Similar(1)
Governmental budgets are ostensibly moral dispositions ― so goes that civic cliche.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com