A first-rate student will excel despite the flying school.
An average student will do well enough in an average flying school.
A poor student will struggle no matter the quality of instruction. You can't make strawberry jam from pig****...
Occasionally you will know that if the applicant trained at school X under CFI Y they will definitely know their stuff, but that only ticks one box in a long list of requirements.
Choice of flight school is not a ticket to a perfect career.
True words from someone obviously experienced in the industry. First rate students get jobs reasonably quickly, average students are next in line and strawberry jam wannabees generally end up in another industry altogether.
An interview and flight assesment is always interesting regardless of the flight school.