I think Eliezer is generally right that reading too much mainstream philosophy — even "naturalistic" analytic philosophy — is somewhat likely to "teach very bad habits of thought that will lead people to be unable to do real work."

Also could you expand on this as I didn't catch it before the edit?

It's not obvious what the "bad habits" might be, and what they are bad relative to. This reads as a claim that would be very hard to defend at face value, and without clarification it reads like a throwaway attack not to be taken seriously.