Yup, that is very much outdated for the Gaisatoi...
There probably were men, who dedicated themselves to some divinity and followed a religious code of conduct, but they were completely different (something related to the lore of man-demons, falling into god-inspired trance). The Gaisatoi were professional bands for hire, with their own hierarchy...
Javelin is a bit misleading, because the Gaesum was very heavy, but yes they did throw them. Still the best description would be throwing spear, such designed to cause great damage to both equipment and foe. Although the idea that all of them would have high quality longswords is overblown, it would've been the prerogative of their respective higher classes. Still these would use primarly an heavy short spear too...
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