Yes? Most people don’t live their entire lives in a lab wearing nitrile gloves, so there’s an argument to be made that the concentration of microplastics found in that setting is not reflective of everyday life.

So, not that microplastics don’t exist, but that they don’t exist to the same degree as in a lab environment.

I wouldn't be surprised if e.g. all these paper-thin synthetic (plastic) disposable parts and fabrics used in labs shed microplastics way more than e.g. synthetic fabrics designed to be survive a machine wash a few dozen times, or upholstery meant to withstand tens of thousands of sitting cycles, nevermind solid plastics (e.g. reusable food containers, furniture surfaces).