I've seen a forward converter described as buck-derived, or buck with a transformer, but buck converters and forward converters are generally viewed as two separate things. I'm not too attached to definitions but I consider a forward converter as using a transformer and transferring energy while the switch is on. This is the definition used by the article you linked to, and by Wikipedia for Forward Converter. I also like the TI poster of power topologies: https://www.ti.com/lit/sg/sluw001f/sluw001f.pdf