Well, this "90,000,000 Turks are on their way!" thing makes them out to be baby-eating monsters (Islamophobic dog whistling, too, if you ask me) but in my experience they're lovely and about as Muslim as English people are Christian.
It doesn't make them out to be anything. However let's deal in facts. Do you think that if the population of Britain increases by 30% (mostly poor people) do you think the Tory government (or even Labour for that matter) are going to increase public spending by 30%. Do you think we are going to virtually overnight increase housing supply by 30%.
No of course what will happen is that spending will stay very similar to what it is now however the amount of people that are reliant on both public spending and housing etc will have gone up meaning there will be effectively less for everyone else. It's not rocket science. It's not hard to understand.
Then when you factor in that unlike other migrants Muslims tend to be more likely to be unemployed (50% men, 75% women) the problem is worse because not only has the population increased but the people relying on the state has gone up even more disproportionately.
It's in a way a very effective way to lower the tax burden on the rich through the backdoor.
Why? Because they benefit from the increase in GDP and demand for housing far more than they lose in the relative decrease in public spending.