Time travel has been a SF trope since H G Wells wrote The Time Machine in 1895.
There have been all kinds of claims of secret government and private research on this topic since then.
That includes a wide variety of folks with entertaining stories about how they are time travelers.
One of the latest variants are the claims of “twenty and back” technology which....
If you are interested you can check on that for yourself.
While I do not necessarily believe any of the stories I am in no rush to dismiss them as crazy either.
If the tech was invented in the future and time travel brought it back—who knows?
Physics professionals have wild debates on the nature of time—there are several different theories on how it works and they are truly “crazy” to folks who have not heard them before....
https://www.quantamagazine.org/a-debate-over-the-physics-of-time-20160719/
OTOH...the book series about a Baron Trump ( the second R is missing ) which was written at the time period that these books were set in, has the description of the buildings and especially the description of the house that Baron lived in, ALL WRONG! If it had included correct or even vaguely similar descriptions, that might, be a different story...maybe. LOL
There's a book that I read when I was 12 or 13 ( I wish that I could remember the title, but I can't ) that was about a few children who go to another planet, where people wore crazy clothing ( whatever they wanted to ), many men had long hair, and it was a populace who believed in "doing your own thing". When the Hippie fad hit, I was reminded of that fantasy book. And the book was also written in the late Victorian era; it was a Brit book, BTW.
As in BRAVE NEW WORLD, we've now reached a point where we are told that we can't use the word "MOTHER", there were test tube babies, and children from an extremely young age were taught all about sexual activities...though "transgenderism" wasn't included. Then there's the "SOMA" ( dope ), everyone having contraceptives ( that was something that at the time was EXTREMELY difficult to get ), and children being raised in what we now call "DAY CARE".
And there is NOTHING whatsoever in the Trump series about a time machine. SO there's just no comparison other than a version of Barron's name and where he lived. But there were NO brownstones on Fifth Ave. at these time that these books were written and never have been. The houses on Fifth Avenue, at that time, were MANSIONS and these were then replaced by department store!