Yeah, I tested his program, and it found dozens of "suspiciously similar" sites (98% similar) because those websites supposedly used the same UPS Store (which is perfectly reasonable for website owners who don't want their home address on whois). However, I checked the actual Whois for those sites and the UPS Store address was not shown in the data, except one. The other sites were in different states! So I have no idea where that information is being made up from. If Google draws such conclusions in their quest to conquer spam, then there will be a lot of false positives.
so donít put more than 2 commercial keywords in your titles or Google will frown upon it
Hmm, I see a lot of well-ranked sites in competitive sectors with 3 or 4 commercial keywords separated by a pipe.