Cannot distinguish reply to previous post vs reply to original post

Sorry for double post, but I just came across this example in the wild

Is the comment “I hope so” referring to the post above, where the poster says they would have worded a comment more clearly if they realized it could have been misinterpreted, and then moving on to a related topic? Or is “I hope so” in reference to the OP asking if sanitizer can be refilled from a larger bottle?

I’m guessing the latter, but why do I have to guess, when the solution (the reply indicator) is an easy way to be clear?