Question: why is this ode Homogeneous ODE of Class C according to odeadvisor?

I can not find my Kamke book right now. But according to Maple help, Homogeneous ODE of Class C is the following

If I understand the above, it is saying that the RHS of the ode should be ratio of two polynomials, and both should be linear in y and x. Correct?

Given the above, then why Maple says the following ode is _homogeneous, `class C` ? Since the RHS is not linear in y and not linear in x:



           [[_homogeneous, `class C`], _rational]

What Am I overlooking/misunderstanding  from reading this definition? 

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