This table says it all... If this table is placed on their website, they're trying to scam. A phone with those specs having a hashrate ~3 times higher than a rig with 13 GPU's.... Not even taking into account the ridiculously low power draw...
It is on their website indeed, and in few other publications. It sounds much better to potential buyers that phone can mine 2 ETH than "buy our phone that is connected to cloud mining pool". Especially since they claim that there will even be a free option, so if you paid phone 600 USD back in mid 2019, you will get 0.2 ETH per month for 3 years. Sounds like a good deal to those that have no idea how mining works, so no wonder that people started preordering them.