Gutentags plugin autoload command not recognized by Vim9

Hi, 

Using Vim9 64bits build on Win10 patch 0744, 

with some plugins installed from vimplug, as gutentags

https://github.com/ludovicchabant/vim-gutentags which has some command in $vim/vimfiles/plugged/vim-gutentags/autoload/gutentags.vim such as Gutentags Update. 

Why this command :GutentagsUpdate is not known by Vim ? 

E492: Not an editor command : GutentagsUpdate 

Thanks

Nv

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