If the blogger lays out all the evidence for why he thinks it's an airplane contrail, and the general gives zero real evidence for his position, it probably puts it at a push. When I can look at the images for myself and confirm that what the blogger is saying is right, I don't need to choose between one opinion or another anymore. I can see for myself that the evidence says it's an airplane contrail.
That blogger is a global warming scientist that creates computer model evidence for anything.