This "blog post" appears to just be copy-pasted content from the NASA article [1]. I give credit for the source being cited, but it's still plagiarism.
There is absolutely nothing wrong in copying from a government website. They're in the public domain, and for good reason. In fact, citing the source isn't even necessary.
For plagiarism to apply, the source must not have been cited, and the source must have been copyrighted, neither of which apply here.
It's a bit of an edge case. It makes a good point and it uses text from a credible source. AFAIK everything NASA publishes is royalty free and can just be copied.
One additional sentence between the image and the content like this and it would probably be fine:
"The explanation from OpenAI has some major flaws, here is how this NASA source explains it:"
> Plagiarism: the practice of taking someone else's work or ideas and passing them off as one's own.
"passing them off as one's own" is the key part. To prevent this, you make it very clear which parts are your own ideas and which parts are not. If you compare the source to this post, you'll see it's a mix, without delineation.
For plagiarism to apply, the source must not have been cited, and the source must have been copyrighted, neither of which apply here.