You're right. I just decreased its speed to 90% and it reads normally like a person reading it instead of sounding sped up. I can now also notice the inhalation of breath between sentences where at 100% speed I didn't notice it at all. I think it actually is a person who recorded themselves reading it and then put the recording through different effects and filters to mask their voice.
If your playback software allows it, I would recommend decreasing playback speed to 90%. e.g. In AIMP player it is in the Sound Effects options, or VLC player in Playback > Speed (or [ and ] to increase/decrease speed finely). You can also use software like WavePad or a bunch of other software to edit the file to always be at 90% speed.
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