Question about dasam granth

SSA ji, I had a question about The dasam granth, I was wondering why is there so much stigma around it, and second, I always thought that we just weren't allowed to eat halal or kosha meat, but in dasam granth it says we can't eat beef either, I thought cows had no sacredness in our religion, could you help me on this topic ?

ਗਾਊ ਘਾਤ ਕਾ ਦੋਖ ਜਗ ਸਿਉਂ ਮਿਟਾਊ । (May I) eliminate the great sin of cow butchering in the world. -Guru Gobind Singh Ji in Dasam Granth, Uggardanti