Koda that doesnt work at all. you can spam HCs but any good player who is rushing will see your 5 labs and kill them pretty quickly.
Really to counter a teir 2 unit you shouldnt have to build a teir 5. and look at how much more expensive HCs are.
the only real counter to lrfs again is with the advent. their scouts have the same stats as their LFs, making them an effective counter to lrfs but, TEC and Vasari scouts dont work near as well.