No it is not. Even the one you linked is from a poll. The CDC pulled the original numbers for DGUs because they're basically impossible to obtain properly and the CDC didn't like that it didn't paint guns in a bad light

Here is the study that was requested by the cdc and by Obama...

https://nap.nationalacademies.org/read/18319/chapter/3#15

Defensive use of guns by crime victims is a common occurrence, although the exact number remains disputed (Cook and Ludwig, 1996; Kleck, 2001a). Almost all national survey estimates indicate that defensive gun uses by victims are at least as common as offensive uses by criminals, with estimates of annual uses ranging from about 500,000 to more than 3 million (Kleck, 2001a), in the context of about 300,000 violent crimes involving firearms in 2008 (BJS, 2010). National Academies of Sciences, Engineering, and Medicine. 2013. Priorities for Research to Reduce the Threat of Firearm-Related Violence. Washington, DC: The National Academies Press. https://doi.org/10.17226/18319.

This part talks about the study you directly linked, which states that respondents were not ansed specifically about defensive gun use.

On the other hand, some scholars point to a radically lower estimate of only 108,000 annual defensive uses based on the National Crime Victimization Survey (Cook et al., 1997). The variation in these numbers remains a controversy in the field. The estimate of 3 million defensive uses per year is based on an extrapolation from a small number of responses taken from more than 19 national surveys. The former estimate of 108,000 is difficult to interpret because respondents were not asked specifically about defensive gun use. National Academies of Sciences, Engineering, and Medicine. 2013. Priorities for Research to Reduce the Threat of Firearm-Related Violence. Washington, DC: The National Academies Press. https://doi.org/10.17226/18319.

So no, it's not, it's also lacking heavily in studies...and as I said why one of reasons the CDC pulled the numbers.