Unwanted vertical space between boxes (offinterlineskip not working)

Question

I thought offinterlineskip would remove the vertical spacing between the rows, but it does not seem to work. I want a small spacing before the last row only.
Does someone know what is going wrong here?
This is the code for the confusion matrix:
{
offinterlineskip
centering
hspace*{0.9cm}MyHBoxy{A}MyHBoxy{B}MyHBoxy{C}MyHBoxy{D}MyHBoxy{PA}par
MyTBoxy{A}{$N_{AA}$,$N_{AB}$,$N_{AC}$,$N_{AD}$}{$dfrac{N_{AA}}{sum_{Ap}}$}
MyTBoxy{B}{$N_{BA}$,$N_{BB}$,$N_{BC}$,$N_{BD}$}{$dfrac{N_{AA}}{sum_{Bp}}$}
MyTBoxy{C}{$N_{CA}$,$N_{CB}$,$N_{CC}$,$N_{CD}$}{$dfrac{N_{AA}}{sum_{Cp}}$}
MyTBoxy{D}{$N_{DA}$,$N_{DB}$,$N_{DC}$,$N_{DD}$}{$dfrac{N_{AA}}{sum_{Dp}}$}
vspace*{2.5px}
MyTBoxy{UA}{$dfrac{N_{AA}}{sum_{An}}$,$dfrac{N_{BB}}{sum_{Bn}}$,$dfrac{N_{CC}}{sum_{Cn}}$,$dfrac{N_{DD}}{sum_{Dn}}$}{-}
}

Boxes:
    newcommandMyVBox[1]{%
    parbox[c][.8cm][c]{1cm}{centeringbfseries #1}%
     }
    newcommandMyHBoxy[2][dimexpr1.25cm+2fboxseprelax]{%
    parbox[c][1.35cm][c]{#1}{centeringbfseries #2}%
    }
    newcommandboxy[1]{%
    fbox{parbox[c][1.25cm][c]{1.25cm}{centering #1}}%
    }
    newcommandMyTBoxy[3]{%
    MyVBox{#1}
    renewcommand*do[1]{boxy{##1}hspace*{-fboxrule}}
    docsvlist{#2}
    boxy{#3}parvspace{-fboxrule}
    }

Zarko · Accepted Answer

Like this?

As simple table with use hhline for horizontal and vertical rules in table, and `makecell for more vertical space in the last column's cells:
documentclass[varwidth, margin=3mm]{standalone}
%documentclass{article}
usepackage{hhline, makecell}
newcommandmcbf[1]{multicolumn{1}{c}{mathbf{#1}}}

begin{document}
[
setcellgapes{3pt}
makegapedcells
begin{array}{r|*{4}{c|} |c|}
mcbf{}     & mcbf{A}  & mcbf{B} & mcbf{C} & mcbf{D} & mcbf{PA} 
    hhline{~|----||-|}
mathbf{A}  & N_{AA}    & N_{AB}    & N_{AC}   & N_{AD}    & dfrac{N_{AA}}{sum_{Ap}}
    hhline{~|----||-|}
mathbf{B}  & N_{BA}    & N_{BB}    & N_{BC}   & N_{BD}    & dfrac{N_{AA}}{sum_{Bp}}
    hhline{~|----||-|}
mathbf{C}  & N_{CA}    & N_{CB}    & N_{CC}   & N_{CD}    & dfrac{N_{AA}}{sum_{Cp}}
    hhline{~|----||-|}
mathbf{D}  & N_{DA}    & N_{DB}    & N_{DC}   & N_{DD}    & dfrac{N_{AA}}{sum_{Dp}}
    hhline{~:====::=:}
mathbf{UA} & dfrac{N_{AA}}{sum_{An}}
                        & dfrac{N_{BB}}{sum_{Bn}}
                                    & dfrac{N_{CC}}{sum_{Cn}}
                                               & dfrac{N_{DD}}{sum_{Dn}}
                                                           & - 
    hhline{~|----||-|}
end{array}
]
end{document}

Unwanted vertical space between boxes (offinterlineskip not working)

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