Well I disagree with that, saying that "some cows are brown" in red directly implies that cows exist. Because it affirms the existence of brown cows.
The problem here is that red by definition can only be used for real statements. Stating facts about hypotetical or fictional concepts is forbidden. Or at least it should be forbidden.
Bertrand Russel is not at fault here because his logic works in a contest where there isn't any assumption of realism in the statements.
For example "some cows are lilac" could be a true statement when there isn't anything that forbids me from talking about fictional cows.
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