But not exclusively. And that is one of the problems. If they marketed it as "only" a meal replacement, the risks would be a lot less severe - after all a lot of people get by just fine with horribly deficient meals a lot of the time. But it's a big leap from "a lot of the time" to all the time over a prolonged period of time.
While I'd love for this to be a safe, reliable option, and might even try it as a replacement for some proportion of meals if/when it becomes more widely available, their marketing claims far exceeds what they have evidence for so far.
I do, along with data from U.S. border services. When possible, I automatically correct it to be more accurate. For example, "no delay" actually means <= 15 minutes or so.
I'm interested in your other data source. I wrote a web app for the U.S-México border a while ago and been using data from the CBP but have found it to not be reliable at all.
The sender gets a notification that you only receive messaged shorter than 500 characters, and you have the option to forward larger messaged to another email address.
My point (probably didn't make that clear) is that might be a reason it's not more popular - because it's not really obvious how it's supposed to work.