blog:http content is usually dynamically managed via asynchronous requests.
Your best bet is to use the Network tab and filter the actual request made by the browser when it tries to expand the resource.
this post was submitted on 09 Apr 2025
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Bring up the video page
On the page do a right-click Inspect (Q), which will bring up the page code on the bottom third of the screen
Play the video, then quickly go to the "Network" tab on the page code
You'll see a bunch of URLs with .mp4 extension
One of those will be the file you're looking for.
Right click on those URLs to open them in new tabs
Obviously skip the filenames with "audio" in them.
When you get a tab with the actual video you're looking for, you can do a "Save As" in the browser to save the video file.