Happy to help, bigboyroeroe123! The discussion of that other question can be found at this link:
In that weaken question, about a possible cause of a certain disease in male cats, answer B offers up a correlation with a different disease, the cause of which is unknown. Many of the cats who get the first disease also get the second disease. Some might look at this as a possible alternate cause of the first disease, but is it? Or is it just a different effect, or even just a different correlation? What about this weakens the argument? And does it do so more convincingly than the correct answer, which is E (the supposed cause of this disease is actually known NOT to be the cause of diseases of that type).
In this question, however, the answer is clearly suggesting that other beverages KNOWN to cause kidney damage could be an alternate cause. It's not that these tea drinkers also have another effect, some other illness that is hard to explain, but that they have another CAUSE of the ill effects the author is blaming on the tea. That's the big difference here. Also, note that in the question about cat disease, the cause of the other disease is unknown, but in this one the EFFECT of the other beverages IS known. That's a pretty important difference between these two answer choices!
Adam M. Tyson
PowerScore LSAT, GRE, ACT and SAT Instructor
Follow me on Twitter at https://twitter.com/LSATadam