That just works around the issue with the convertor handing the M140 Snnn Tn commands.
There are plenty of other commands you can use that accomplish the same thing. For example, go to your firmware configuration and change the set bed temp text to "M140 S$" (remove the T0 part). You could also change it to say "M133 T#", although that does a full wait to stabilize which would be terrible during a live print. The extruder would be oozing all over the place. But the key is, all of these things are just work-arounds to the issue with the convertor (feel free to look through the binary files if you need to prove it to yourself). Everything the software is putting in the output gcode files is correct, and in fact, it is doing exactly what you tell it to!