This is baloney but expected of them to make it sound simple so other countries seem inept for not having done it already.
It is just too far to the sun to make it in a non-stop trip as described. No one can make the trip in just 4 hours.
They would have to travel in the shadow of Venus and then lay over behind Venus until the start of night time and then head towards Mercury, again using it's shadow and a lay over until night time.
From there the "Run to the Sun" would be the simple matter they describe.
The return trip, of course, would have to follow that same procedure in reverse.