While hundreds of people have climbed all 58 (ish) Colorado peaks over 14,000', only a few have climbed the highest 100 summits in the state, those over about 13,800'. The generally-accepted list of "Centennials" below the 14,000' mark is here: https://www.14ers.com/13ers/13ers.php?listd=list&sublist=cent&range=&routes=ignore&displaytype=0 Note that these high 13ers are generally way less traveled then the 14ers, and several of them are more technically demanding than any of the 14ers.
The Highest Hundred were first completed by Spencer Swanger in 1977, a feat accomplished over many years. Unlike the 14ers, which have records going back decades, there hasn't been a strong push to complete the Centennials as fast as possible until very recently.
Interestingly, the first documented completion of the Highest 100 in a single season was also done completely self-powered by Rob Barlow, who used a bicycle to travel between trailheads. Barlow completed the challenge on 9/8/2016 in "a little more than 71 days". (https://www.denverpost.com/2016/09/10/rob-barlow/). Barlow's trip was done in supported style. Since several of the generally-accepted 14ers (all points over 14,000' that have been given names by the USGS) lack at least 300' of prominence and are therefore not officially "ranked" peaks, Barlow actually completed 105 summits on his trip.
In 2017, Justin Simoni repeated Barlow's self-powered Highest Hundred but with the added wrinkle of being entirely self-supported.
Way to go, Andrew!!!
It should be noted that this Centennial FKT is actually for 103 recognized summits because a long-running legal dispute over peak access to 14ers Lincoln, Democrat and Bross) forced him to drop those 3 walk-up mountains and replace them with the next highest peaks: American, Niagara and Trinity. American and Niagara have reasonable, straightforward approaches (albeit higher effort than Democrat, Lincoln or Bross), but Trinity is remote and a significant effort addition over the peak it replaces.
At some point during the attempt, but after Andrew had done his replacement summits, ownership caught wind of Andrew's Centennial FKT attempt and granted him access, which he accepted. So he DID the 100 highest AND ALSO #101, #102 and #103.
This would be a 'weakness' in the FKT that might allow someone with access pre-granted to the disputed summits to follow a more efficient route (and fewer summits)..
except this FKT is so far out beyond Jupiter, I don't know who (other than Andrew perhaps) could plausibly beat actually beat his 2021 FKT. I'm not even convinced Andrew of 15 years ago could beat contemporary, older Andrew.
He always is self-effacing in saying that his FKTs could be beaten by a professional ultra or trail runner, but in practice, they tend to get hurt in the attempt. It seems pain tolerance and body awareness are the pre-requisites for something this extreme, not top-end speed.