1 way using Array formula.
Formula:
IFERROR(INDEX('source data'!A$3:A$10000;SMALL(IF('source data'!$N$3:$N$10000="Non-Lagged";ROW('source data'!A$3:A$10000)-2);ROW('source data'!A1)));"")
-- Array(CSE) { }, formulae are confirmed with Control+Shift+Enter.
Not just Enter.
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