i think snows just trying to express how rare cases like yours are...Acrylic is EASILY blemished by small scratches, scuffs, spider cracks from drilling, etc....some people are even as anal to flame polish the inside if holes drilled, even when its never seen...peoples standards differ, if the maker puts out a flawless acrylic tank (assuming its a custom job) chances are it'll get scratched, nicked, or scuffed by just setting the thing up..minor or not..
There are many manufacturers out there for custom tanks...your budget plays a big role in what you can get...choose names you trust, otherwise speak to people who have had tanks made by them...Good luck!