Types of push button mechanisms
That's probably the only mechanism you'll find in small pushbuttons like that.

However, the mechanism is really not relevant.  You shouldn't be looking at that level of detail, especially since you apparently know little about pushbutton design tradeoffs.  What you should be looking at are specs like on-resistance, bounce time, maximum lifetime activations, etc.  How the manufacturer achieves those doesn't matter.

This type of switch mechanism has been used in many places quite successfully.  If a reputable manufacturer guarantees 100k operations, then I'd take that at face value.  You are starting with incorrect assumptions, then over-thinking this.  Stick to your requirements and how those are met as described in the datasheet.