Im am no expert, but have been in CT and the area around many many years.
If low winds, you go south to Platboom and similar (Scarborough and Witsands), where the wind usually is a lot stronger, if not much further north where it on occassion but not often, can be stronger.
Muizenberg is not really a kite or windsurf wavespot, as wind is usually onshore, and less wind, usually more stable than most other spots, and we always go there to surf instead of using a kite or sail, as good waves even when no wind.
Capetown (which is quite far away from Muizenberg) has all its known beaches starting from Sunset and then all the way up around Big Bay and Haakgat and to Melkbos - almost same wind, not always very stable as sideshore sometimes a tad off just corrected by the coast.
Further north, at YzerFontein, sometimes mega swell periods, and can be wind there too.
Finally Langebaan which is mostly a flat water spot - can be windy and good very often yes, but not super windy that often.
My point is, one can NOT compare if the wind was gusty or not, at one place, regarding how it was at another spot - they are totally different windwise so you have to kite at the exaxt same spot and time of day, to know how the wind was.
Sorry, not much contribution here, just that one can not compare wind strengths or gust between spots in South Africa in and around CapeTown.
Condolenses to the family, sad, and we apparently dont know much it seems?
Peter