I know reading a full fledged science paper is way beyond your intellect. But the actual paper actually stresses more presence of non-ruminant lipids as compared to ruminant lipids (which were negligible) so lot of forceful fitting to come to conclusion. https://twitter.com/ReallySwara/status/1336934666545336320

Plus, they use carbon isotope analysis to make out ruminants from the sample and because the diet for cattle is considered dominantly C4. But the sample isn't strong enough to differentiate between meat and maybe dairy product itself.
Rest is just media exaggerations.

The paper itself tells that it could have come out dairy products. Cattle could include cows as well as buffaloes.
Though I personally I believe that cattle emat consumption could have prevalent in that age before society changed.