No 'GOTO', use 'if' instead?

Is this legal code for Linuxcnc and is its effect to skip the lines between the 'if' and the 'endif' lines?

M05
G0 G53 Z40
G0 G53 X190 Y0
O100 if [2 GT 5] (always false condition)
G00 Z2.0000
G00 Z20.0000
M05
O100 endif
M02

Thanks for your answer and while[0] looks better.
As to why I would do this, I use PCBgcode which produces gcode to mill PCBs but it includes stuff that I don't want. PCBgcode has a mechanism to include lines of user gcode at user selected places so I can use this mechanism to automatically skip the parts I don't need rather than having to manually delete them every time.