This is not how templates in bbPress work. The list you posted is for the fallback templates, in case of required templates are missing. If bbPress loads templates from this list, it will load using theme compatibility method so it will work with all themes.
To modify actual bbPress content templates, the best thing to do is:
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Create folder bbpress in your active theme folder.
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Open wp-content/plugins/bbpress/templates/default/bbpress and there you will find all content templates bbPress uses to display forums, topics and so on.
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Any template from there you want to modify, copy to your theme bbpress folder (from step 1) and modify them there. bbPress loads templates from that location if they are present and if not, it will fall back to files in the folder from step 2.
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Each template from that folder uses bbp_get_template_part to load other templates in that same folder. If you have bbp_get_template_part(‘loop’, ‘forum’), it will load file called loop-forum.php.