I’m personally not a dev, maybe amateur dev, but I am a professional I.T. consultant and sysadmin, and I have used and thoroughly enjoyed Twilio’s tools for years. They are accessible enough for even low-skill amateur devs like me to be able to spin up test programs and functions that do really cool things. I am heartened to hear that my longtime support has gone to a company whose culture and leadership have been worthy. Hoping for the best to everyone involved.
Can't speak for the guy you asked, but I'm approximately his skill-set, and that's what I've used it for.
Long time ago, though; I can't speak to the developer experience now. $20 and contact customer support... What? It used to be easy. Like, create an account and ten minutes later your in business, easy. I used them for a number of (free-tier, I think) personal and (paid-tier) professional projects, and was a very satisfied customer.