That article was written by the wife of the owner of Bug Engineering, (K&P Engineering) and if anyone does some sleuthing, can see some discrepancies in the verbiage. Go Kart MFG built their own track on their own property, so it stands to reason they would not allow competitive businesses on their track.
As far as the hoops on the early flea, it does make sense they'd used them for a prototype or two. It does not make sense they'd use kart parts for follow on production, since a kart took one of those hoops to build, and a flea bike took three.
Lastly, the comment she makes about Go Kart beating Bug to market with the karts by a week is hugely misleading. Duffy Livingstone, Art Engles and a few others were building and selling karts out of Livingstone's muffler shop way before Bug was a company. However when the Go Kart name was registered as a trademark, and sold under that name, I could concede Faye's point- which is really moot.
This video of Duffy Livingstone might shed some light:
[video=youtube;flBTTmEZ_Pg]https://www.youtube.com/watch?v=flBTTmEZ_Pg[/video]