Yes but "talking to your customers" is universally applicable and valuable advice. One could argue that it's of even greater value if you're targeting a niche with only "a few customers" because you need to ensure you really deliver enough value to get them onside and paying a rate that ensures you generate a profit.
I think most small companies were talking with customers for long time. The challenging part of this advice is talking with your customers at scale and separating signal from noise.
