vim9 | how to force legacy vimscript execution

Hi,

I am currently using this legacy vimscript https://github.com/tweekmonster/startuptime.vim.

It is managed by Plug.vim plugins' manager in my vim9script _vimrc.

It appears startuptime.vim warns on some script code such as :

    echomsg 'Tagbar: Vim versions lower than 7.0.167 have a bug'
          \ 'that prevents this version of Tagbar from working.'
          \ 'Please use the alternate version posted on the website.'

identically warns on if brackets spread on multiple lines.

How can I fix it or fix this call of legacy vimscript ?

Thank you

NiVa

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