It's not like this guy claims that a team wanted to trade their all-star for Wesley Johnson in 2010. Trading #6 and #18 for #4, especially given the fact that team with #6 and #18 also held #5, is not something outrageous.
Just pointing out the fact that acquisition of James Johnson might once again be the case of Petrie liking the player and getting his hands on the said player a couple of years later.
It's not outrageous on the face of it, but it's pretty clear we coveted Tyreke in that draft. If I've got my timeline right, Gavin's Gush to the crowd at ARCO about Tyreke and his 7-foot wingspan happened almost immediately after the pick, not the hour or so later that Johnson came off the board. So it seems at least a bit unlikely in this case that we had a deal lined up to trade him.
But my major point is that this was from a random guy on the internet with no source, not even a rumor of it at the time (sure, there was a rumor we like Flynn, but that's it). It's more than likely either a pinch of truth with some runaway imagination (perhaps we had a discussion with Minny regarding #4 for #6 + #18 if Griffin/Tyreke/Harden went 1/2/3, giving Minny their shot at Thabeet) or made up entirely. I can make stuff up, too. I just don't trust random three-year-old rumor over common sense + what I know.
So, there's no reason to think Petrie hasn't liked Johnson - we did work him out - but I just don't think this adds any evidence to that.