Confusion of Confidential Transactions
When we're talking about an amount like 133.7 BTC, we're actually talking about 13370000000 satoshis (13.37 billion units).

If you're using 32-bit rangeproofs in Confidential Transactions, you're limited to a range of 1 through 2^32-1 satoshi (42.94967295 BTC). To use a number as large as 133.7 BTC, you would need 34 bits at least (making the proofs larger and slower to create and verify).

What the section you're quoting is about is that CT supports scaling this number by a power of 10. Basically, the proof can (in the clear, for now) indicate that it is not dealing with satoshi units, but with millions of satoshis. Now a 32-bit proof can deal with ranges of 0.01 BTC through 42949672.95 BTC.

So the term "floating point" here simply refers to the fact that we're representing the number as 13370*10^6 satoshis rather than as 13370000000 satoshis. It does not mean we're dealing with fractional units.

Note: multiplying an EC point with a fractional number is technically possible in some cases, but not really used here.