Huh, no. If an argument has premises “all X are Y” and “John is an X” and conclusion “John is not Y”, it is broken. Whether the conclusion happens to be true because one of the premises is false is irrelevant.
The argument’s stated premises were “X are Y”, you decided to interpret the ambiguous statement as “all X are Y” and then complain that it makes the argument formally false.
Huh, no. If an argument has premises “all X are Y” and “John is an X” and conclusion “John is not Y”, it is broken. Whether the conclusion happens to be true because one of the premises is false is irrelevant.
The argument’s stated premises were “X are Y”, you decided to interpret the ambiguous statement as “all X are Y” and then complain that it makes the argument formally false.
Re-read the fifth word of this comment. (Or am I missing something?)
You may want to (re)read this comment to see/remember how this discussion started.