requirements for non-unusuals and unusuals are slightly different so it would be required.

'You can also use screenshots of Gladiator.tf stats pages as proof as long as there are 3 sales at a certain value'

the glad.tf value mentioned is actually only what the item was listed at before it sells / moves and there have been multiple cases in the past where the bot doesn't actually sell the unusual for pure but items or sometimes even lower than the listed amount.

it is not necessarily required for most non-unusuals as of now as they typically do sell for full pure as seen with every other sale on that crossbow