M3 4M B1Z4RR0! M3 N0 UND3R5T4ND L33T SP34K!
If you had fun "decoding" this, good for you, but let's not overplay the importance of this. It's a fun little test to see if people understand the very basic "replace a letter with a similar looking number" concept behind L33T (that's "Leet" for those unable to translate my complex code) that's existed for over 30 years on message boards since the creation of the internet.
Cute time-waster, sure. Epic proof behind the power of the human mind to crack complex codes, not so much.