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My guess would have been the video was made with an animation program like Adobe Animate (the product that was previously Adobe Flash Professional and before that Macromedia Flash) or Adobe AfterEffects.

It's a video.

Correct!

>Seems to have been custom coded to generate each frame?

What?

What seems to be "custom coded"?

What even is "custom coded"? Custom as in oppose to "standard coded"?

Why would you need to write any code to generate a frame for a video?

Lots of animations are generated by code partially or fully. But I read the question here as whether this is rendered in real time on the browser via custom code rather than a video codec. This is because the sharp black and white graphics appear almost vector like. However it’s a normal video.

I meant that watching this video made me realize that one could write a program that generates the graphics, like in a video game, and then captures that in a video file, without any intention to run the program separately. A programmatically created video.

>Lots of animations are generated by code partially or fully.

Few, maybe some, not lots. Unless you count using any piece of software as coding which seems silly.

It embeds Vimeo. https://player.vimeo.com/video/844198233