Do they state somewhere that they are having 1000+ users specifically from Chrome Store? Because I can see that they have live extension on Apple App Store which takes 25th place in travel category in US. Downloads on App Store are not public, but I'm pretty sure they had to have at least some downloads on there to make to the top 30 travel apps.
https://imgur.com/aZAtEB6
Also they do not state if 1000+ are active users or total users who installed extension because Chrome Stores only shows active users count