Would using 'they/them' in publication biographies stand out?
As a reader, familiar with the gender-neutral usage of they/them, I wouldn't consider it weird. Beware, however, of two facts:

Papers are read by international readers with different levels of English who may not clearly understand the usage.
Frequently copy editors (e.g. I'm familiar with IEEE on this) heavily edit the biographies to adapt them to the publishers' editorial styles: sometimes, I have found that in doing so the copy editor introduces significant errors (because e.g. they do not understand local information). So, if you submit a biography using the pronouns they/them check carefully the proofs and be prepared to ask for changes defending your choice.