Rename Bibliography while using APA7 package

Update

Following https://github.com/dan-weiss/apa7-latex-cls-source/issues/20, version 2.08 and above of apa7.cls no longer hard code the bibliography title and make it possible to use the title argument to printbibliography.

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Old answer

apa7.cls hard-codes the bibliography heading as follows

AtEndPreamble{%
  @ifpackageloaded{biblatex}{%  the user has loaded biblatex
    @ifundefined{def@man}{%
      defbibheading{bibliography}{section*{normalfonttextbfrefname}}%
    }{%
      defbibheading{bibliography}{clearpagesection*{normalfonttextbfrefname}}%
    }
  }{}
}

while something like

AtEndPreamble{%
  @ifpackageloaded{biblatex}{%  the user has loaded biblatex
    @ifundefined{def@man}{%
      defbibheading{bibliography}[refname]{section*{normalfonttextbf{#1}}}%
    }{%
      defbibheading{bibliography}[refname]{clearpagesection*{normalfonttextbf{#1}}}%
    }
  }{}
}

might have been slightly more flexible as it would have allowed for the title option of printbibliography to work properly.

You can counter the definition apa7.cls makes as follows (we need to use AtBeginDocument to come in with our definition after apa7.cls' change takes effect), but you may want to notify the author of apa7.cls about this. Maybe they would like to change things so that the title option becomes usable again.

documentclass[stu, american]{apa7}
usepackage{babel}
usepackage{csquotes}
usepackage[
  backend=biber,
  style=apa,
]{biblatex}
shorttitle{Hello}

AtBeginDocument{%
  defbibheading{bibliography}[refname]{clearpagesection*{normalfonttextbf{#1}}}%
}

addbibresource{biblatex-examples.bib}

begin{document}
nocite{*}
lorem
printbibliography[title={New Reference Title}]
end{document}