I can talk a lot about this, since this is the space I've spent a lot in experimenting. All I will say is that all these detectors (a) create a ton of false-positives, and (b) are incredibly easy to bypass if you know what you are doing.

As an example, one method that I found that works extremely well is to simply rewrite the article section by section with instructions that require to mimic the writing style of an arbitrary block of human written text.

This works a lot better than (as an example) asking to write in a specific style. Like, if I just say something along the lines of "write in a casual style that conveys lightheartedness towards the topic" is not going to work as good as simply saying "rewrite mimicking the style in which the following text block is written X" (where X is an example of a block of human written text).

There are some silly things that will (a) trigger human written text to be detected as a AI and (b) that allow to avoid AI detection, e.g. using broad dictionary tends to trigger AI bots to detect the text as written by AI. So if you are using Grammarly to "improve your writing", then don't be surprised if it gets flagged. The inverse is true too. If you some statistical analyzes to replace less common expressions with more common expressions, AI-text is less likely to be detected as AI.

If someone is interested, I can talk a lot more about hundreds of experiments I've done by now.