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I think this is the straight link:
https://www.aliexpress.com/item/33018362830.html?storeId=707941&spm=2114.12010612.8148356.5.5bc26dabJVfiIy

Andybibbville, with enough power the XHP50.2 LED is capable of 2500 lumens but that driver will only provide enough power at max to produce 1500ish lumens, or as Texas Lumens points out 1335ish lumens.

A P60 drop-in by default does not make good contact with the P60 host body so it doesn’t transfer heat away from the LED too well, more power means more heat so if you were to use a driver that provided enough power to produce 2500 lumens you would need improve the heat transfer path between the drop-in and the body or the LED and drop-in would very quickly get hot enough to damage components.

There are 2 possible reasons why the description states 2600 lumens when it should say 1500 or less. The first is that the seller is exaggerating the performance of their product, it’s common for sellers to do this but with no experience of this seller i can’t say whether this is the case or not.

The second reason is that they have confused the 3V XHP50.2 output with the 6V XHP50.2 output.

Lumens are a product of power, the more power the more lumens (within the LEDs working range).
Power(measured in watts(W)) is a product of voltage(V) and current (A). W=VA. This means that if you double the current from 3A to 6A while keeping the voltage the same you get double the power. It also means that if you double the voltage from 3V to 6V while keeping the current the same you also get double the power.

So, with a 3A input, a 6V XHP50.2 will get double the power of a 3V XHP50.2 and will therefore produce more lumens. Most information online relates to the 6V XHP50.2 so it’s possible they have quoted the expected lumens from a 6V XHP50.2 running at 3A rather than a 3V XHP50.2 running at 3A.