That statement is incorrect. Altostratus clouds are actually higher than regular stratus clouds.

Here's a breakdown:

* Stratus clouds are low-level clouds, typically found below 2,000 meters (6,500 feet). They appear as a gray, featureless sheet covering the sky.

* Altostratus clouds are mid-level clouds, typically found between 2,000 and 7,000 meters (6,500 and 23,000 feet). They are often gray or bluish, and may appear fibrous or striated.

So, the order from lowest to highest would be:

1. Stratus clouds

2. Altostratus clouds

Let me know if you have any other questions about clouds!