Jonny, that pipe is thicker but it's still going to keep you up at night.
The main reason rubber pipes burst is heat.
They're more pliable when heated, and stretch more...and eventually pop undr pressure. (Nick's comments were right on the money.)
The major reason you use silicone is because it's heat resistant to 300+ degrees and keeps its shape. Find a decent three-ply silicone elbow for $30-40 and you'll never have to worry about it.