Given that many gels have something like 25mg or 40mg caffeine, I can see how 200mg caffeine might be alarming. If anything, though, the gel industry is under-dosing their caffeine amounts per gel, on average, just to meet market desires.
200mg caffeine is below the recommended dose per literature standards for probably >50% of forum users. 3-6mg/kg is recommended for events under 6 hours. Probably more necessary for very long events as the physiological half-life of caffeine is very roughly ~6 hrs.
200mg is certainly not in the realm of dangerous, or even close to it.
Taurine is not a stimulant.
Theanine is not a stimulant.
For context: My wife took 1600mg caffeine over a 24-hr ride. She’s 63kg. I’m 94kg and have taken 2000mg in a shorter duration than that.
Even if 3+ of those 200mg caffeine gels were taken together, 99.9% of folks would have nothing but a great day on the bike.
Disclaimer: this is not an endorsement to increase anyone’s caffeine dose. Talk to your medical doctor. Don’t do it if you have high blood pressure. blah blah blah. 
PS. That SIS product marketing is top notch. How to get people to increase their caffeine intake to actually-performance-enhancing amounts: label it nootropics.