If you want a truly "Vishuddha" experience, download the Sanskrit text alongside the English. This allows you to see exactly what is being translated.
Yes. Many modern Indologists (e.g., Patrick Olivelle, who published Manu's Code of Law in 2005) acknowledge that the manuscript tradition of Manu is highly corrupted. The "Vishuddha" effort is a layperson’s attempt at the same critical scholarship.
The Vishuddha Manusmriti deals with a wide range of topics, including:
Covers 12 chapters addressing creation, social duties (Dharma), and judicial codes Specific Teachings
No. Some traditionalists reject the concept of interpolation entirely, believing every verse is divine. Others accept it. Most scholars accept critical editions but disagree on which verses are spurious.