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I would imagine that any pedal with a low output impedance would serve the function of a buffer for the signal path leaving that pedal. If that pedal is  at the end of a huge pedal board, you might still need a buffer at the start of it to drive the signal from the pedal board input up to that point, since your signal is going through some amount of cable from your guitar into the board and through all the cables connecting your pedals before hitting the last pedal on your board. I think that's the idea behind having a buffer at the start and possibly end of your board.

I'm not super knowledgeable about impedance though so someone else might want to chime  in and confirm this.

I am using 100nf for C2, although the cap it's "replacing" is 1uf, could this be the issue? Will try replacing it tonight.

I built this mod and added it to a wampler faux analog echo. It works fine initially but after about 10-15 seconds, I start getting distortion and the audio signal slowly fades until the pedal is completely silent. Unplugging the power adapter and plugging it back in brings back normally functioning but the same fade out/distortion happens each time.

I'm not super tech savvy with circuits yet, but could someone point me in the right direction in terms of troubleshooting? Thanks so much!