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Most likely is trying to replace any tab for a coma.
However, in POSIX the RE bracket expression [\t] would try to match a literal back slash or a t character.
In any case there's no advantage to...

As Aia said, the BRE [\t] will match a single <backslash> or lower-case letter <t> and the substitute command s/[\t]/,/g will replace each occurrence of either of those characters with a <comma>. ...