No it really is not. CPI-U is manipulated to make it seem like inflation is almost at zero therefore limiting the cost of living increases for SocSec and other government programs.

So instead of having a 2% CPI, we actually have closer to 9%

It also allows companies cover for Wage Compression because many employers base at least part of annual raises on "Cost of living Adjustments" so if the government is saying Inflation was 1.9% well then the cost of living adjustment for my salary may be 2% with another 2% for performance based or 4% total. But if actual cost of living went up by 9-13% which is likely my real buying power for the next year dropped by 5%.