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The thing is the only reason you'd do this instead of just modifying the flash would be to more easily survive updates, or if the flash is programmed too late in the process to hijack.
Also note that the location of the implant is obviously not a normal capacitor/etc, because it's in the middle of an alternate SPI flash footprint. However, that is not a constraint if you're backdooring a system and you know they never populate the alternate footprint.
FWIW, here's a high-res photo of the same board. Nothing suspicious on this one.https://twitter.com/IT_Creations/status/1047939818867445760 …
I just saw that. Scary because it looks more than legit.
This... 
And why not go a little less obvious and just pop a part on the second footprint (presuming it's for alternate which is also SPI flash)... I dunno, currently a bit sceptical... funny decisions, modifications to the board to facilitate, etc...
They would've moved the vias. If you're editing the design, you're editing the design, nothing stops you from making minor adjustments to existing bits.
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