The thread was talking about PCB manufacture, so it can be argued it's the correct topic, and there was only a single posting - so it can also be argued it's not spam. The odd spelling or gramatical mistake should not be an issue. Their attempt at English is a lot better than our attempt at Chinese Mandarin.

If it helps anyone to produce lower-cost or better quality PCB's, then should it not be left in place for the benefit of the forum?