Flagging Non-consecutive overlapping dates

In the approach below, we generate a list of dates for all date ranges.  Next we group by location and then combine the list of dates. .

Now we compare Current Row Date List to (Combined Date List without Current Row's Values)

If there is any matching dates then it clashes.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUQpOzi/JScxLATINDPUNzPWNDIxMgRxDE30DCxDHTClWJ1rJCFWpkaW+oQFY6aEFIMVAriFEJ0ixMZpiA7gshGOEUGpCirmmmO4FyxoAOcaGUHNNlGJjAQ==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Location = _t, #"Start Date" = _t, #"End Date" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Start Date", type date}, {"End Date", type date}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Date List", each List.Dates([Start Date],Duration.TotalDays([End Date]-[Start Date])+1,#duration(1,0,0,0) ) ),
    #"Grouped Rows" = Table.Group(#"Added Custom", {"Location"}, {{"Rows", each
        let dates = List.Combine(_[Date List])
        in  
            Table.AddColumn(_, 
                "Status", 
                (x) => if List.ContainsAny( List.Difference(dates, x[Date List] ), x[Date List]) then "Clash" else "No Clash"
            ) 
        }} ),
    clash = Table.Combine(#"Grouped Rows"[Rows]),
    #"Removed Columns" = Table.RemoveColumns(clash,{"Date List"})
in
    #"Removed Columns"