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I do think that both the suffix "-cide" and the transitive verb "committed" insinuate wrongdoing and I in fact appreciate avoiding that phrasing out of respect for the deceased and their families.
On the other hand my younger sister took her own life in 2014 and my uncle took his own life in 2017, and that's the phrasing I've used, whenever I've felt the need to share these biographical details. Doesn't discard their agency, but also doesn't stigmatize. I can't help but think that the style guide would be better served by this established vernacular. It's both clear and respectful, and I wouldn't even really call it a euphemism.