If a sentence means the same thing when you replace Group A for Group B, then you accusation is probably rubbish.
Explain why those two sentences mean the same thing.
No. Actually a few quick checks: is English your first language? Do you agree that the words "cyclist" and "motorist" refer to different (albeit overlapping) groups of people? Do you agree that the sentences
"Motorists kill hundreds of people every year"
and
"Cyclists kill hundreds of people every year"
make two different claims about reality, and that one is true and the other is not?
If you answered "yes" to all of those, now explain to me how "motorist" and "cyclist" can be interchanged in that sentence without changing the meaning.
Explain why those two sentences mean the same thing.
No. Actually a few quick checks: is English your first language? Do you agree that the words "cyclist" and "motorist" refer to different (albeit overlapping) groups of people? Do you agree that the sentences
"Motorists kill hundreds of people every year"
and
"Cyclists kill hundreds of people every year"
make two different claims about reality, and that one is true and the other is not?
If you answered "yes" to all of those, now explain to me how "motorist" and "cyclist" can be interchanged in that sentence without changing the meaning.