Most likely but thats not 100%. Unfortunately the specs may not be correct if the manufacturers of the individual input components and materials have not been honest.

For example there is a hospital in Australia (http://www.abc.net.au/news/2017-06-30/lead-levels-in-perth-c...) that has been massively delayed due to lead mysteriously appearing where there should be none and asbestos also appearing where there should be none. From what I know, the sources have turned out to be manufacturers in China either knowingly misrepresenting their products or using contaminated materials in their own manufacturing.

Unfortunately testing is the only way to be sure.

It may be an all-stainless chassis, but in a $250 dollar machine, my guess is you're getting a brass boiler.

Edit: nope, you're right. SS boiler apparently

A stainless boiler is just 2 stainless steel cups held togheter by a clamp, it shouldn't affect the price much, my 120€ delonghi has one.

Yeah, I was pretty much assuming that all the cheap machines would use standard small diameter copper plumbing rather than pay for all stainless fittings all the way through (which would be somewhat specialized from a plumbing perspective), so it wouldn't really matter much whether the boiler itself was or not.