The supply is actually infinite. New coins will always be created forever into the future. That’s Infinite. I understand it’s a tapered tail end whatnot, but the calculus still equals infinity. 
From 2017 to now, Monero has made negligible gains or losses, and perhaps does hold up to the claim of storing value if measured in USD, but that’s like measuring with a ruler that keeps changing in scale. 
We choose to measure our wealth with a ruler that stays the same, forever. We choose #Bitcoin and it’s true limited supply.