Cutting aluminium on a table saw is no more difficult than cutting really HARD wood. Of course all due care and safety much be in place. Yes a mitre guide etc. and safety glasses as a minimum. It looks to me that the photo is showing a negative rake blade is being used for cutting aluminium. This type of blade is used in SCMS/mitre/chop saws when cutting aluminium extrusions. While I appreciate the safety aspect, I don't think it is an absolute necessity to use this style of blade (negative rake) in a (properly set up and properly used) table saw.
I have done this on .5" (12mm) aluminium plate, using a normal (crosscut) wood blade. Treat the aluminium as hardwood and proceed slowly. Be aware that the aluminium tends to stick to the teeth of the blade. If you need to make numerous cuts, check the teeth before making each cut. The blade will still cut with gummed up teeth but the finish tends to be poor.
Cutting aluminium freehand, without any form of guide is not wise, but cutting aluminium on a table saw can be quite safe.