This paragraph seems to explain the discrepancy.
"Not all of those removed will have been arrested deep within the country by ICE. Many will have been detained at the southwest or northern borders by Border Patrol and effectively turned around or sent back home. Others will have been in detention for multiple years before removal orders are given."
I wouldn't conflate denial of entry and deportation if I was trying to make some analysis.
BTW, I was not trying to be antagonistic when I asked where you got your data.