A "Prehistoric Millipede" sighting

This post "debunks" a sighting shared anonymously on The Pine Barrens Institute website -
https://pinebarrensinstitute.com/user-submitted-encounters/2023/4/24/user-submitted-cryptid-sighting-prehistoric-millipede

I think the site is dodgy to begin with, but this story is almost certainly fake (but still fun regardless). 

The millipede, called a "prehistoric millipede" by the witness, was sighted in 1977 after a heavy rainstorm, by a witness known simply as "Jane". Jane was 18 at the time of the sighting, and saw this millipede alongside her younger sister, age 12 at the time. 

The two were looking out their window at the blacktop driveway below, which was illuminated by a light. They saw a large millipede crawling, claimed it was about 3 feet in length and 5-6 inches wide; thick-bodied with many legs. Jane compared it to a "prehistoric millipede" (presumably Arthropluera based on the next comment) and stated that it wasn't fully grown; unsure of how she'd be able to determine that. Jane claims to be a "researcher at a large hospital in Boston" and stated that "no such creature exists".

This story really sounds over-exaggerated, if not an outright hoax (the story was submitted anonymously as a hoax, there's no loss for lying).

The largest millipede in North America, as far as I can tell is Narceus americanus, the American giant millipede, which only reaches 4 inches, while the largest in the world, the giant African millipede (Archispirostreptus gigas) only reaches a little over a foot in length. 

I'm not certain of the ins and outs of calculating millipede size, nor what the largest diameter to length ratio recorded is, but using both that giant African millipede and apparent smaller Arthropluera specimens/species as a basis this "prehistoric millipede" is pretty damn wide, a ratio of 6 to 7.2, compared to 4.78 for Arthropluera and 5.07 for the giant African millipede (assuming everything was calculated correctly). 

(By the way, the millipede described would probably have to be female, as male millipedes thin out quite a lot when they reach maturity)

Absurd dimensions, drastically larger than anything currently known already make this sighting questionable, but the location makes it even more unbelievable; millipedes get larger in tropical or arid environments, and tend to get smaller in colder ones (at least as far as I can tell). A massive millipede seems quite out of place, even as an escaped pet.

I've discounted the possibility of Jane seeing a centipede because

a - Somebody who has researched these animals would know the difference between the two, regardless of local vernaculars

b - The largest centipede, Scolopendra gigantea, does not grow more than a foot

Although there were no major myriapod discoveries/pop culture phenomenon during either 1977 or 2023, I think general inspiration by media may have resulted in this story, especially since it mentions Arthropleura.

(LOOP's Arthropluera was not debuted until Sept. 2023, after the story was shared)

A giant millipede isn't too unbelievable to those who don't know much about these bugs, especially when Arthropleura exists. Seems like somebody who knew something about biology or recently rewatched WWM submitted this story for shits and giggles.