This is a normal sane piece of text written by the author of this tool. What you do with it is none of my business.
dIS 1S a NoRMaL sAnE PIeC3 0F t3xT wrITTEN bY da AuThoR oF thIS TO0l. waT u D0 wid 1T iZz noNe of maH BuS1neSs.
The conversion library (typ3r.js) used by this tool is at aviaryan/typ3r.js. Please send patches in that project.
PS - Contributing is simple, see index.js file. It has all the required transformations. Editing it is as easy as editing a JSON file.
Thanks to @anshumanag on Twitter for the idea.