That’s a good point, maybe he did want to sound English.I can understand that on joining the carry he wanted to sound English hence the change from his Italian one. No idea why Foster not Smith or Barker.
There are a lot of pages but this entry may be of interest. He seems to statement has no brothers and sisters.
View attachment 208135
If he is passing himself as a Foster (true or not) then he would have had to say his father was deceased. Not certain he was but his mother is married to another man so has to say