Let me split this in two parts.
TiO2 coating - This one I knew was a fraud even before I bought item. To make it look like a human, the amount of carbon-dioxide it needs to produce is humongous. There is no way a small amount of coating can release so much. You will need several Kgs of TiO2.
The blueish light - I hoped that this might work and I had no way to verify without actually buying the product and trying it out. Turns out that it does not work.
I kept it in dark place in my small garden in the balcony where sometimes there are no less than a 100 mosquitos in 4m x 4m space and it could not catch even one of them overnight. I tried this for more than a week under various conditions. wind/no wind. Complete/partial darkness etc. It did not catch a single mosquito.