Correct, though you can essentially edit the 'decompiled' code directly at low level (then put it back into a binary), and for some languages this is even tolerable e.g. languages which compile to CIL.

OP didn't do this, because as they said: "I don’t like writing assembly". Although what they did is arguably harder...which maybe was the point! After all they could've just hooked up an MCU to proxy the button press for a given duration, which would've taken a lot less time.