The script works, without any change in color, however:
plot '_numXY' using 2:3:(sprintf('%d', $1)) \
with labels offset 0,1 point pointtype 6 ps 2 notitle lc rgb "blue"
The points are black. I want to see the points in blue color.
Why does lc rgb "blue" not work?
The lc settings are ignored for the labels plotting style if they don't follow immediately the point option. In your case you must only place the notitle at the end.
plot '_numXY' using 2:3:(sprintf('%d', $1)) \
with labels offset 0,1 point pointtype 6 ps 2 lc rgb "blue" notitle
As a demonstration example:
set samples 11
set xrange [0:10]
plot '+' using 1:1:(sprintf('%d', $1)) \
with labels offset 0,1 point pointtype 6 ps 2 lc rgb "blue" notitle
The result with 4.6.5 is:

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