You really shouldn't say stuff like this, if you aren't careful someone might believe you even though you are 100% wrong.
People used to say that about the s7s all the time. An s7 at 10c power was profitable until about 3 days ago....the s9 will be making money for a long time to come.
First of all it's about ROI, not profitability,
Yes an S9 that is running now and has already paid for itself will be profitable for a little while longer, however, buying an S9 now is silly, the numbers just do not show they will ever ROI based on current network growth rate.
And if an S7 was "profitable" (not ROI'ing) until recently but now it's not anymore, that should tell you something shouldn't it?
How much you earn from your miner is determined by the miner's hashrate vs. the total network hashrate.
An S9's hashrate is about 2.8 times that of an S9, that means that the total network hashrate has to just get multiplied by 2.8 for an S9 also to become unprofitable.
As I mentioned in the post above, the network hashrate has doubled in the last 2 months, and it is growing even faster now, much faster. So how long do you think an S9 will remain profitable for?
Just do the math!