“Per halacha, Jewish Press, D. Carnegie, etc… it’s impossible to make someone else happy.”
It’s definitely possible to make someone else happy. The halacha says so very clearly. A husband has an obligation to make his wife happy.
Regarding the Jewish Press and Dale Carnegie – they are not sources. I don’t know anyone who would use the Jewish Press as a source. Dale Carnegie is very wise, but even he is not a source.
In any case, they were probably talking about someone who is depressed (and not because of you). But a husband definitely has the power to make his wife happy in most cases.