I have that exact same one, mine set-up in very similar way, just put some headers instead of cutting and rerouting the DTR. Still doesnt work for me thou!
@bromatt when you say "it doesn't work for me" what exactly are you experiencing. If you can't reprogram it even manually with a (well-timed) reset button push then I'd stop investigating the DTR pin and look at the rest of the circuit, especially the TX vs RX as Lakes points out. That one (inverted serial pins) foxed me with an entire workshop full of people when I'd done the diagram they were all working to the wrong way round [facepalm].