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Urdu (and IIRC Western Punjabi, i.e. Punjabi as spoken/written in Pakistan) prefer to use the Nasta'liq variety of Arabic script, and historically Persian (Farsi) was written in Nasta'liq. And it is not the case that Nasta'liq is written on a base line--in fact, characters in a word tend to slant down to the left.

One of the three rules on the page do not apply to either Persian or Urdu. The article “Al” isn’t used in them, so the third rule doesn’t apply.

I also thought it might've been about the differences between them, given that Pashto has its own characters unique to its script and Arabic has diacritic marks not used by Farsi or Pahto. This is a different subject, though, that has little to do with what the post is complaining about. Their grievances apply to all scripts based on Arabic.