It's dangerous to be dogmatic about 'who-wore-or-used-what' when talking about the Roman army. During the early Republic there were troops who used a stabbing spear, the hasta and where therefore known as 'hastatii' (literally, 'spearmen'). It's also clear from grave stelæ dating from the 1st century AD that both legionary and auxiliary troops used the throwing javelin (pilum, pl. pila). The fact that this figure has been given a pilum should not be regarded as being wrong - it's quite likely that by this period such troops were so armed.
This figure is wearing the 'Newstead' form of lorica segmentata armour, which differed in several important respects from the earlier 'Corbridge' form. The sculptor has caught all these various changes well. He has also modelled the late-pattern Imperial Gallic helmet extremely well. However, the shield has been painted as the one recovered from the site at Dura and this comes from a later period than the figure (mid 3rd century AD).
My only real criticism of this figure is that the sword scabbard is far too long. It's of a type known as a spatha and these were mainly used by cavalry soldiers (because they needed a longer reach) but were later adopted in general by the army. The problem here is that the man could not draw this weapon because it is longer than his reach! Either the sword should be shorter, more like the gladius Hispaniensis, or the scabbard should be slung much lower down.