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If you need to import the presets into mobile version of Lightroom, then only files you need are DNG-files from “mobile_presets” archive.
The much better and easy way is to install desktop version of Lightroom and sync all presets in official way. If you use official version of Lightroom and Adobe’s cloud then you can use Presets Synchronization procedure described here.
For the desktop version you’ll need XMP-files. Lightroom Classic version 7.3 changed the presets from .lrtemplate to .xmp format. The ‘lrtemplate’ files are a thing of the past. You need to update your software with a subscription plan to the latest versions of Photoshop and Lightroom Classic.
The new XMP preset takes advantage of the new profiles feature in Lightroom 7.3, it won’t work in the older version of Lightroom.
So from the Lightroom Classic version 7.3 you can follow standard procedure for presets importing (“+” sign from presets panel in Lightroom) and it will automatically be visible in Lightroom after a restart.
To keep your Lightroom up to date you have to check Adobe’s website.