I don't think that going thru one little cloud meets the requirements of IFR, but it would be a real bummer to meet a 747 in the middle of that cloud. I do suspect that the FAA is going to want to have a talk with him tho...
The FAR's have a slightly different opinion of what VFR flight requirements are.
Nowhere here does it say you can fly through a cloud.
Sec. 91.155 Basic VFR weather minimums.
(a) Except as provided in paragraph (b) of this section and Sec. 91.157, no
person may operate an aircraft under VFR when the flight visibility is less,
or at a distance from clouds that is less, than that prescribed for the
corresponding altitude and class of airspace in the following table:
Flight
Airspace visibility Distance from clouds
Class A Not Applicable Not Applicable.
Class B 3 statute miles Clear of Clouds.
Class C 3 statute miles 500 feet below.
1,000 feet above.
2,000 feet horizontal.
Class D 3 statute miles 500 feet below.
1,000 feet above.
2,000 feet horizontal.
Class E:
Less than 10,000 feet MSL 3 statute miles 500 feet below.
1,000 feet above.
2,000 feet horizontal
At or above 10,000 feet MSL 5 statute miles 1,000 feet below.
1,000 feet above.
1 statute mile horizontal.
Class G:
1,200 feet or less above the
surface (regardless of MSL
altitude)
Day, except as provided in Sec.
91.155(b) 1 statute mile Clear of clouds.
Night, except as provided in
Sec. 91.155(b) 3 statute miles 500 feet below.
1,000 feet above.
2,000 feet horizontal.
More than 1,200 feet above the
surface but less than 10,000
feet MSL
Day 1 statute mile 500 feet below.
1,000 feet above.
2,000 feet horizontal.
Night 3 statute miles 500 feet below.
1,000 feet above.
2,000 feet horizontal.
More than 1,200 feet above the
surface and at or above 10,000
feet MSL 5 statute miles 1,000 feet below.
1,000 feet above.
1 statute mile horizontal.