Do baristas make their own milk?

Hi, i'm studying coffee and always struggle to steam milk and get the texture correct. But sometimes when I drink coffee at a cafe or restaurant the texture seems very thick and creamy which I haven't been able to get this same texture from normal milk before. Even my teacher who is more than 10 years as a barista his milk texture isn't that thick either and he's a teacher and very qualified barista.

It seems to me that the milk is being mixed with cream or something to create this very thick texture it's the only explanation I can think of because I checked to see how much air was in the milk and it's normal amount of air not over done and steamed too long either.

What are your ratio or recipes for creating your own milk? Can anyone share their milk recipes like do you mix with cream or are you using other ingredients to improve the texture?