So long as restricted air space was not invaded, he has no issues.
The question is how much airspace will be restricted as a result of this video?
the problem here is not restricted airspace (which is a specific term... restricted airspace can be found on charts and is labeled, for example, R-2515 (part of the Edwards AFB complex)), or a Military Operations Area (MOA). The area of the flight is in the mode C veil of SeaTac airport, where transponders are required (within 30nm of the airport and from the surface to 10,000ft)... there are exceptions to this requirement for glider ports, some older aircraft without engine-driven electrical systems, but even those need 1hr advanced notice/approval from ATC in this airspace. Even if this were not within 30nm of an airport, it is over what is known as a ‘congested area’, which is also a specific term, and is designated on FAA terminal area charts (TACs) with bright yellow swaths in urban areas. No model aircraft operations are allowed over congested areas. I’m not sure what the interoperation is within your own property, below controlled airspace, but I’m certain it is not allowed over someone else’s property over congested areas. The FARs are a joy to read, and sometimes seemingly contradictory, but it is pretty clear this type of operation is illegal... whether it is considered a drone, an RC aircraft, or an ultralight aircraft... it is illegal. The only aircraft allowed to operate in this area are helicopter along prescribed helicopter routes... Class B airspace floor is at 1800 ft, and the space needle is over 600ft... you cannot be within 2000ft of the space needle (laterally) unless you are 1000ft above the space needle (and that is assuming it is the tallest thing within that radius). The guy has a number of issues (legally), the question is simply how hard the FAA wants to come down on him.