He traveled from Washington to Philadelphia. For the prices he is quoting, I suspect he bought his tickets very shortly before he traveled. I went on the Amtrak website, and for travel on August 22 and 23 (random weekday dates I picked more than two weeks out), I found first class tickets each way for $173, or about a third of what he paid.
I have traveled first class on Acela only once and I enjoyed the food service. I got my ticket using Guest Rewards points, so there are ways to avoid the "sticker shock" effect of the article. Other than that, I thought it was an informative article and I am glad to see Amtrak doing innovative things to improve the onboard experience for passengers.