You can't really just walk in and say "Well, no, guys, listen, let me tell you how it really is" and just dismiss the whole basic notion of the paper without giving sources.
EDIT to add: The blurb says that the author "finds much lacking in the business's importance and effectiveness and much that is problematic in advertising's social impact." (my emphasis).
Once the Depression was over, the trend line does not appear to be unaffected, though the reasons it trended as it did aren't simple to attribute. Cigarette companies were already advertising to women before Bernays' PR campaign, but they increased their advertising afterwards as a response to it.
If the OP study found the opposite, it wouldn't have made it to the top of HN, and if it did, every comment would mock it for using correlation and would be pointing out other explanations.