I agree with this because the Corinthian church was yet carnal and worldly and needed to be corrected....yet they were still saved and identified as a New Testament Church........JESUS also speaks to being "weighed down" by surfeiting and drunkenness and numerous verses speak to the reality of worldly carnal believers that are saved, but not yet transformed.....
It's so easy to for forget or neglect
Psalms 103:6-14
6 The Lord executes righteousness
And justice for all who are oppressed.
7 He made known His ways to Moses,
His acts to the children of Israel.
8 The Lord is merciful and gracious,
Slow to anger, and abounding in mercy.
9 He will not always strive with us,
Nor will He keep His anger forever.
10 He has not dealt with us according to our sins,
Nor punished us according to our iniquities.
11 For as the heavens are high above the earth,
So great is His mercy toward those who fear Him;
12 As far as the east is from the west,
So far has He removed our transgressions from us.
13 As a father pities his children,
So the Lord pities those who fear Him.
14 For He knows our frame;
He remembers that we are dust.