This is not true at all and I don't know where this is coming from. The signal to noise ratio in the mainstream media's personal finance pages is famously low. The WSJ is known for its reporting, not its investment advice. And had you bothered to look up the author on Wikipedia, you would have seen he doesn't work in equities, and apparently never has.
Sure, the author might turn out to be a genius who identified all the factors that will lead to the next big crash--if so, how come the genius reasoning is not evident in the article? Assertions like the second item--'the Fed is buying Treasuries, must mean they're nervous'--are presented in an unconvincing way. I assumed it was self-evident that these claims were unconvincing, but apparently it wasn't so.
So here's why that claim, among others, was uninformed: the Fed's stated policy is actually to not change the size of their portfolio of securities held outright. The treasury purchases are offsetting principal payments of other debt. The neutrality of this policy does not suggest 'nervousness' at all. http://www.newyorkfed.org/markets/opolicy/operating_policy_1...