the man talks too fast
The man talks as fast in slow speed as in fast. Can't understand him!
If there is a sentence I just cannot understand , I type it in Google Translate (the voices are usually clearer). Then I can go back and forth between Google and DL until the DL voice makes sense.
You've gotten to level 25 without understanding there's people on here not studying Spanish so who would have no familiarity with the voice you're referencing — and that there's a specific forum for issues with Spanish?
Not that anybody can actually help you with the problem of not understanding speech other than to tell you to practice more. Or file a bug report if what you mean what you say literally and it's not just hyperbole since that would mean something is technically amiss.