Trans etiquette wise you aren't correct. If someone transitions you apply current identity to all photos taken beforehand because the person is the same person. In the same way a picture of a pilot taken before they got their pilots licence is still a picture of a pilot your current understanding of a person updates to current and is retroactively applied.
Saying " this is so and so back when they were a woman" is considered rude since people generally look at their pre transition selves as not having a gender that aligns with their birth sex but rather a stage where they and other people around them did not know their current needs. People will generally not check you on it though if they think that your understanding is very basic. Proper nuance would say "Back when they identified as a woman" because then the implication is that the person didn't nessisarily change, but the general understanding and social category did... but functionally speaking it's close enough for someone who isn't up on best practice.
It was actually super cool, when Elliot came out he went to the showrunners to let them know they had nothing to fear, he wouldn't change his appearance or anything because he was signed on for the show length.
And the show runners in an industry first established a new gold standard by telling him "Nah, how about we just make Vanya into Victor and make it canonical." So they worked with Page giving him a lot of creative control over the character's personal journey and showed probably the best depiction of early transition on tv.