Don't feel intimidated if you have any curiosity about learning the language. From an outside perspective, all languages are immensely complicated. In fairness, even native Chinese speakers wouldn't be able to comprehend the poem above when spoken aloud. It's designed specifically to mess with people and make them think about language. I love poems like this but there's an argument that they are disingenuous and exaggerate the difficulty of learning a language.
You clearly know English, so as a counterexample to show what you are capable of, take a minute to check out The Chaos by Gerard Nolst Trenité.
In honesty (my last comment was clearly not legit), you likely do pronounce the 'L'; most accents will include this in my experience.
Does the tip of your tongue touch the roof of your mouth just on or behind the ridge before your front teeth? If you release your tongue before pronouncing the 'D' is there a release of air? If you do position your tongue here and there is no release of air before pronouncing the 'D' (which does release air), then you are pronouncing the 'L'.