Why does a city redevelopment make no sense? Redevelopment of cities is a common discussion in modern times. The only things needed for city redevelopment are a plan, money, and political backing. The reason given for the redevelopment is specifically so people and Pokemon can coexist better, there doesn’t need to be any greater reason. The Japanese Twitter also says “it doesn’t look like the previous Lumiose City.” If the blueprint was supposed to be the city being redeveloped into the one in XY they wouldn’t say that. It does absolutely have some major changes by the way, like a park and a canal.
Another thing to note is that the majority of the tailer is through the lense of a computer rendering of a blue print, complete with electronic music. This absolutely gives a modern day vibe. If this was supposed to take place in the past they would surely stick with the sketch aesthetic and not use electronic music. Why would they announce the game with a trailer that doesn’t actually represent the setting or time period?
On the subject of clothing, it is not an architect’s job to predict future fashion, nor would they be particularly good at it. An architect drawing people would use the fashion of their time. Through out the computer rendering section everyone is wearing modern clothing, but we get a more detailed look at the start (shown in part in the message you quoted.)
This is outright modern fashion. Overall we have form fitting clothing, modern jackets, a baseball cap, etc. In more specific details the man on the left is wearing sneakers and the woman on the far right has high top converse shoes. As I said earlier an architect is not going to predict future fashion, especially to this degree of accuracy. On the point of clothing in PLA, none of the fashion in that was as anachronistic as what’s shown in this trailer if the intention is for this game to take place in the past, excluding the starting outfit which was literally from present day.
As an extra thought, presumably with the redevelopment being a major focus of the game it will be finished within the game, so why would the blueprint be representing the city 100+ years in the future?
Ultimately everything in the trailer points to a modern setting and nothing really points to the past. I think people are getting too hooked on the fact that Paris was renovated over 100 years ago and ignoring what the trailer actually shows.