Yep. It's 100% obvious what he's talking about if you just read the two lines that he posted, but I guess you had to be pedantic and talk about the exact definition of the word "float" instead.
Personally, I keep about 0.1 BTC on my TREZOR, in a separate account to my savings, for any BTC spending opportunities that pop up. If I'm considering alts, I tend to dig into my savings - the 0.1 BTC is more spending money for merchants and to donate to websites if necessary.
Whenever I need to do something significant though, I can easily just convert some alts into BTC or dig into savings.