The instinct of whether to trust a site is affected by many different things, some of them conscious, some not.
The decision of whether to trust will not be based entirely upon colour. There will be a multitude of cues that will help or hinder trust!
Let's say that like in your example, the branding and colours used on the site are very much in tune with the product being displayed (as in your screenshot). This creates continuity, harmony and balance - a few (of many) precursors for trust.
If you changed the colour to something else, you create separation, conflict and disparity, some (of many) precursors for distrust.
So whether or not you find evidence that says 'dark colours do not promote trust', you have to consider the relevance of that evidence to the scenario in which the research was carried out, against the relevance of the colour to your actual scenario.
A few subsequent questions are then:
- Was your choice of dark colour for a good reason?
- Does that reason help engage your users?
- Does the effect overpower any evidence you may find for dark colours creating distrust?
And if the answers are yes:
- Does it matter what you find out?
- Are you actually going to do anything about it anyway?
- Just how bad does the evidence have to be in order to get you to change the colour to another scheme?
- What other colour are you going to use?
- Is it better to use red or yellow just because it makes people happy?
- Is that a better reason than the reason you chose black?
- Are the compromises that come with changing the colour better or worse than the compromises you make by keeping the black?