I didn't download your file.

IF(COUNTIF('Tech info'!BK2:BK30,">0")=0, "No Artifacts", FILTER('Tech info'!BJ2:BJ30,'Tech info'!BK2:BK30>0))
The Excel version would be...

This array formula**:

=IF(COUNTIF('Tech info'!BK$2:BK$30,">0")=0,"No Artifacts",INDEX('Tech info'!BJ:BJ,SMALL(IF('Tech info'!BK$2:BK$30>0,ROW('Tech info'!BK$2:BK$30)),ROWS(A$1:A1))))

** array formulas need to be entered using the key
combination of CTRL,SHIFT,ENTER (not just ENTER).
Hold down both the CTRL key and the SHIFT key
then hit ENTER.

Copy down until you get blanks.