In the Top Photo archive site the image is reversed, I don't know which is the right way, it might have been the Life Picture Editor which decided the most common orientation. Deciding the original intention of a photographer is hard unless they're in Magnum. In Topham's case he was a freelance.
To be honest, if they had wanted it colourised then they would have either done it themselves or had it done at the time. They probably wouldn’t have waited 80 years for some ai-tech to do it without their being asked.
Pretty much all of the colourised images look like they have been coloured-in, with the colours looking flat and false. Colourised moving pictures often have all of that and poor registration, sometimes with weirdly aliased chroma components that jitter. Personally I like B&W, as original.