I recently joined the forum and interested in getting a complete bike too (would be my first road bike) but I am skeptical about the price of the bikes you linked. I mean, for starters how would you know if the groupset is an authentic Shimano 105? Seems a little too good to be true. In general, where do the suppliers usually skimp on the quality to meet the price point?
From what I've read on this forum so far, it seems like people only go for individual frames / groupsets / rims when going down the aliexpress route. Why aren't the complete bikes more popular?
These are the claimed 105 components:
Derailleur Handle SHIMANO 105/R7000-22S
Front Derailleur SHIMANO 105/R7000
Rear Derailleur SHIMANO 105/R7000
The rest are not 105 and likely inferior (crankset, chain, etc.). You can click on the seller reviews and see some comments from purchasers, although they are not terribly detailed.
Personally I do not buy a complete bike, because I want to fit specific components to it, most of which would not match what this vendor is using.
I have not seen fake Shimano 105 shifters, but maybe someone else can comment if they have.