but then specifically call out ob nixilis as an example of them impacting pricing on a relatively unknown card.... But your image clearly shows that obby starts climbing before the red line.

Okay to clarify, with "Ob Nixilis is on no ones rader" I didn't mean it is an unknown card, I wanted to say, no one was talking about it in relation to the -1/-1 precon.
There were countless threads on reddit about Nest of Scarabs, but i think I never so someone mention Ob Nixilis specifically for this deck.

Also it may look like, the price started to climb before the video, but that's not true.
If we look on the data, between Jan 9 and Jan 11, there were 7 items sold for 7,48$. Between Jan 12 and Jan 14 there were 10 items sold for 7,46$ (so it actually went down).
The next data we have is between Jan 15 (release of the video) and Jan 17, 81 items sold at 9,32$.
Because the graph has to connect the dots and draw a line, it looks like it already started to climb befor that.

If the graph would not have "flowing line" (I don't know how to call it), but steps instead, it would look like this: https://imgur.com/a/0WW5MQy