Flux core is widely used through out heavy industry and is a great process to be adept with. Definitely a bread and butter process.
That being said, is this a nationally accredited(AWS or CWB) course? I noticed that it says "a Weldtech certificate will be given" which is not to say that you won't learn anything, but a corporate cert may not necessarily meet the training requirements and weld quality standards required to pass nationally and internationally accepted standards for a given code specification. There is also the issue of whether or not the corporate cert. is on par with the national cert if it is required that a welder be both certified and qualified, which is sometimes the case. If it is not on par or recognized as valid, then it is not worth anything in that regard. I could start company PeteM Weld Training and pass people as PeteM certified with stationary I picked up at Office Max. It means absolutely nothing to anybody though.
Then there's welder qualification (or "in house" testing). In a qualification test you must pass any number of weld configurations using the different types of electrodes, with settings within a certain range, that are then tested to the standards required of the work to be qualified to do that specific work. Some (virtually all) places put more value on this than on a certification. A cert means you did a passable weld once. The qualification test means you did it or can do it as a working welder. You do not need to be certified to be qualified. A lot of really great welders are qualified with no certs.
So, practically speaking, you can be qualified without being certified.