No, @RBI haven’t issued any notice stating a Note with anything written on is not valid.
But it does asks people not to write on it.
Source: https://m.rbi.org.in/scripts/BS_PressReleaseDisplay.aspx?prid=35717 https://www.facebook.com/SMHoaxSlayer/photos/a.147357335599672.1073741828.140690692933003/377448875923849/?type=3
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