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> They seem like a company where most people can work from home.

That's probably true, but the PPP loan covers economic impacts as a result of COVID-19, which can be things like "nobody wants to buy our books that are primarily sold as training materials." 340 people might include sales or actual book production, but it's hard to say without more transparency what the money actually went to/for.

Their conferences business took a huge hit.

Huge hit is a bit of an understatement... they've cancelled all future conferences, likely permanently

Why permanently?

The people who built it up are now gone

I think they have live trainers and a fair bit of conference business as well.