Was Soviet tourism agency "Intourist" used in the 1930s with the primary goal of propaganda?

I have read an opinion that the Soviet government agency of "Intourist" founded in 1927 was used primarily for propaganda of Soviet lifestyle to foreign tourists to the extreme lengths of a) prohibiting Soviet citizens any unsupervised contact with the tourists under the criminal law, b) making the trips as cheap as possible, so no income was even planned from the tourists, c) constructing the experience "Truman show" style, where all Soviet citizens they interacted with were either working with or for the NKVD, or specially instructed on how to behave or what to share. Is it true or is it hyperbolized?

One of the prominent examples mentioned is Dennis Nowell Prewitt who was a client of Intourist before he supported the USSR invasion in Finland. And then was expelled from the Labour party.