They probably have one guy at a company and add it, based on a survey/form where people could in theory lie about where they work or add previous positions if they're unemployed. Note the companies aren't subscribers, an 'engineer' from that company is a subscriber.
For some companies on that list, we do have more than one engineer subscribing, and for in many cases we've spoken to them to learn about their motivations and feedback. We also have a Private Leaderboards feature for teams.
In the past few months, a nice small win for Paul and I is what we like to call the "Slack Share Effect".
It's when one of our users shares CodeCrafters within their company Slack, and then we notice multiple new users that work at the same company. When we get in touch with them, I always enjoy asking "how did the OP describe CodeCrafters on Slack?" and 100% of the time, I discover that customers do a better job describing CodeCrafters than we ourselves could. It's also how we uncover use-cases :)
The logos highlight companies where our customers (the engineers) work. Since we're early stage, so far it's more common for engineers to discover CodeCrafters, sign up by themselves, and expense it to their company. That might explain why you can't find information about subscription on the intranet.
We also do have cases where we work with companies to land team subscriptions, so if you'd be interested for us to engage with your company, feel free to drop me a note — sarup@codecrafters.io, and I'd love to help. It might be that the person you couldn't locate has moved on from the company, but I don't have a good explanation for why you couldn't find them on LinkedIn :-D If you emailed me, I could ask them and find out for you (for references, etc) — for most listed on the website, I've been in contact with them :)
If you look them up, you'd get a sense for their background / role, etc :)