Hello hrithik, first of all, Thanks alot for reading my article, Really appreciate that. When I say all conditions have been met, I am implying that conditions such as Normality, Linearity, Homoscedasticity have been met which are the basic assumptions of Linear Regression.

The Displacement and horsepower are highly correlated with each other and that's why we cannot use them.

Yes, This analysis has been done only for Linear Regression