You should have something like this
family inet { filter output-limit { term 0 { from { source-address { 192.168.1.66/32; } } then { policer policer-1mb; accept; } } term else { then accept; } } }
Without that term in the end everything else except 192.168.1.66 will be blocked. They don't focus on that in the KB you refer to. But they have term 1 that allows traffic for all other users.