I'm so glad that Sir Mo has chosen to share his story. There is so much ignorance about the realities of trafficking and migration.
There is no real risk to Sir Mo regarding his citizenship. He is considered a national treasure and there isn't a chance in hell that the Home Office would actually strip him of his nationality. He knows this, I'm sure, but he is trying to make the point that others cannot be so secure. Others, trafficked to the UK as children and exploited as modern slaves, were just as much victims as he was, but they haven't won any Olympic medals, and so their situations are more precarious.
So glad that Sir Mo had an amazing teacher to confide in, and who helped him. The teacher must be so proud of all that he has gone on to achieve. I wonder how many kids never get that kind of help and support though.