Didn't say they were..."the more F2P options" is what I wrote, in other words they're more accessible than the NP5 Bond 10 Kintoki he posted in his initial guide. Being F2P and having an NP5 Lu Bu, Waver, Martha, and Black Grail is definitely not a stretch.I'm really not sure how any of that qualifies as "F2P" strategies.
Besides these are for one shots. There are plenty of way to kill them in 2+ turns as an F2P player. And this is just a guideline. The idea is you're supposed to take it and rework it to what you have.