Home court advantage seems like a really hard stat to track for the sake of comparison. Gonzaga only has two losses during the last 4 years (62-2). But, of course, their home schedule is significantly weaker than FSU's.
I kind of like the idea that you mentioned earlier to compare winning percentages at home compared to percentages on the road. Only problem with that, is if FSU is winning 95% of their home games, and only 47% of the road games, there's obviously a pretty big gap there. You're looking at 47-48%. The reality is, Kansas, Gonzaga, Villanova, Virginia, and probably a few others have won well over 60% of their road games during the past 4 years. It's impossible for a team winning 60% of the road games to match FSU's gap between home and road winning percentage.
Looks like the gap for Colorado is a little higher - closer to 49%. Perhaps that's partly due to the elevation. And Air Force, Utah State, and Utah all find themselves all in the top 10 of KenPom's ranking. So maybe there is something to that. I see West Virginia coming in at #2. That, to me, makes sense because the other Big XII teams would have a much longer travel time to get to Morganton. So, KenPom's stat doesn't so much tell us where the hardest venues to play necessarily are. But, more on the basis of which teams play significantly better at home than on the road. It does seem weird that FSU has only lost 3 games in the past 4 years at home and they're not ranked in the top 50. Not looking at the margins of victory over that time span, I can't help but think that means they've won a lot of close games at home - and lost a lot of close games on the road. Perhaps the depth of FSU, compounded with the noise factor, is what helps FSU prevail at home more often than not?
Also, I do see some limitation in his stat if he's trying to track the past 60 home games and 60 road games. An ACC team might play 15 home games, and 10 road games. To get a sample of your past 60 games, you would need data from the past 4 years for home games -and your past 6 years for road games. I don't like the idea of including road games in the sample, when the home games for two years would be excluded. Anyway, I'm rambling a bit. I think KenPom's ranking makes sense as it measures the average margin between road and home games. But, I acknowledge that this stat is really, really difficult to judge on a comparative basis. Would love to know what the actual algorithm is. At any rate, what FSU has done over the past 4 years is mind-blowing. It's something to be proud of - and it's much more impressive than the Zags home record, given the competition.