Load conditionally

[Deleted user]

Does the plugin load conditionally just for delphi and pascal files or do I have to write something like:
Plug 'mattia72/vim-delphi', { 'for': ['delphi', 'pascal'] }

[mattia72]

This is a filetype plugin, so the commands, mappings, menus etc. will be available only for delphi files. The necessary autocmd-s are defined by the plugin.
The filetype delphi is defined also by the plugin, so

...{ 'for': ['delphi'...

makes no sense, I think. You should ask the developer of vim-plug

However

...{ 'for': ['pascal'] }

might work, but it won't bring too much benefit.

If doubt, You can examine the output of

vim --startuptime 

and memory consumtion.
Let me know, if you find it is usefull!