4% of leavers (and 1% of remainers) have changed their mind
Most people will assume this means: 51.89-4+1 = 48.89% leave and 48.11+4-1 = 51.11% remain.
But if it's a percentage of the voters who have switched it remains a slim Leave majority:-
Leave: ( 51.89 * 0.96 ) + (48.11 * 0.01) = 50.2955 Remain: ( 48.11 * 0.99 ) + (51.89 * 0.04) = 49.7045
Although I suspect the figures are rounded to the nearest percentage and therefore all bets are off; it doesn't take much (4.4% and 0.8%) and the calculation swings to remain (just).
tl;dr meaningless stats are meaningless
But if it's a percentage of the voters who have switched it remains a slim Leave majority:- Leave: ( 51.89 * 0.96 ) + (48.11 * 0.01) = 50.2955 Remain: ( 48.11 * 0.99 ) + (51.89 * 0.04) = 49.7045
Still a crushing mandate for destroying the country, mind.
@kl started
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Most people will assume this means: 51.89-4+1 = 48.89% leave and 48.11+4-1 = 51.11% remain.
But if it's a percentage of the voters who have switched it remains a slim Leave majority:-
Leave: ( 51.89 * 0.96 ) + (48.11 * 0.01) = 50.2955
Remain: ( 48.11 * 0.99 ) + (51.89 * 0.04) = 49.7045
Although I suspect the figures are rounded to the nearest percentage and therefore all bets are off; it doesn't take much (4.4% and 0.8%) and the calculation swings to remain (just).
tl;dr meaningless stats are meaningless