I think there is a subtle difference between he has been living and he lived. He has lived in the UK since 2015 emphasizes the date and the time that has passed. He has been living in the UK since 2015 emphasizes the place and his activity.

people would understand them as being the same in that context. 1= he came to the UK in 2015 and is still living in the UK [present perfect continuos] 2 = the same it is just a different way to express it, using a different tense. [present perfect] From a dictionary: The verb live like the verb work (in the sense of having a job) can be used in the present perfect or the present perfect continuous, with no change in meaning. So the sentence "I have lived in London for five years" has the same meaning as the sentence "I have been living in London for five years