The Wash Post had an obligation to inform the readers of this guys political leanings and his donations to Hillary. They didn't and didn't fix it until called out by another paper.
Yes, it is his opinion, but his partisan opinion. This is fake news, misleading the reader into thinking this guy had no agenda. I can certainly discount his opinion since it is tainted. Just as you can discount the opinion of a conservative.
I don't discount opinions of conservatives. I use them to learn and decide for myself. I use liberal opinions for the same purpose.
Per the column in the WaPost; agreed that there should have been full disclosure and it was unfortunate that it did not happen at the time of original publication.
I'm more interested in what we can learn from the column. Sounds like a disillusioned member of the intelligence community, and he may not be the only one. Also, despite reports from the WH to the contrary, Trump's rant in front of the CIA Memorial did not sit well with all persons that attended.
What I learned from the column is that the Trump administration needs to work overtime to mend fences in the intelligence community.