Yes, a low credit score means that companies find you untrustworthy. That is after all what the credit score is about.
Your credit score is an attempt to measure trust. If many companies have lent you money and you have paid them back as agreed, then you have built a lot of trust with those companies. You therefore have a high credit score. If you haven't paid them back, then they don't trust you and you have a low credit score. If few companies have lent you money (little to no history), then they can't measure your trustworthyness and they give you a middling credit score.
Does a person with bad credit always mean untrustworthy? Of course not. A very trustworthy person may have had a bad hand in life. But companies don't care about the fact that you lost your job just after you got cancer when you worked at Enron, etc. They care about the fact that you did or did not pay your loans as agreed. You could have had proper insurance to cover all of those issues, but you didn't. So, it may be a flawed view of trustworthyness, but it is the only view we can realistically get.