I have seen some similar questions in the forums, but did not understand the answers provided.

Is there a way I could remove lists of tables and figures from my toc?

Here is my a M.W.E similar to the original document.

\documentclass{abntex2}

\begin{document}

{...}

\end{document}

• Do you really need all those packages to reproduce the problem? If so, just drop lipsum - problem solved. This can't be something you need in your document and you aren't using it in the example, either. – cfr Nov 26 '17 at 22:26
• @cfr sorry. There are more in my document. I was not sure what was causing it, so I kept some of them to show the problem. – Arthur Carvalho Brito Nov 26 '17 at 22:27
• @cfr is does not solves the problem in the original file. – Arthur Carvalho Brito Nov 26 '17 at 22:29
• Your example should demonstrate the problem. Find out if they are causing it by removing them. Put them back if the problem goes away. Of course it doesn't solve the problem. That's my point. – cfr Nov 26 '17 at 22:29
• an abntex2 template is not a MWE... Just try the basic: \documentclass{abntex2} \begin{document} ... \end{document}. – Joseph Nov 28 '17 at 21:23

abntex2 is a class that loads memoir as base class, which in turn provides starred versions of \tableofcontents, \listoffigures and \listoftables, so using those macros removes the listing of the \listof... in the ToC.

The manual of abntex2 explicitly mentions \listoffigures* etc. on page 31 (however, in Portuguese)

\documentclass[
12pt,
openright,
oneside,
a4paper,
english,
brazil,
]{abntex2}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\makeatother
\usepackage{array}
\usepackage{pifont}
\usepackage{caption}
\usepackage{changepage}
\usepackage{amsmath}
\usepackage{lipsum}
\usepackage[brazilian,hyperpageref]{backref}
\usepackage[alf]{abntex2cite}
\usepackage{placeins}
\usepackage{flafter}

\makeindex

\begin{document}
\pdfbookmark[0]{\contentsname}{toc}
\tableofcontents*

\renewcommand*\listfigurename{Lista de figuras}
\listoffigures*

\listoftables*
\cleardoublepage

\end{document}
`