I have not read the blog you are speaking of, but this technique is being used more frequently.

There is one straightforward way to do this to produce a photograph with a much greater than normal/typical depth of field.

Use HDR image processing techniques with each subsequent image that contributes to the composite having the focus shifted slightly. A little tricky as moving the camera while refocusing can be difficult to avoid.

Shifting the focus point further and further into the picture can increase beyond hyperfocal ranges the depth of field perceived. By using the optimum focus as a opposed to the infinity or magic point of hyperfocus, the image can be extremely clear and well defined from front to back, i.e. greater DOF. A moving subject of course is out of the question.

The HDR (High Dynamic Range) or XDR (Extreme Dynamic Range) resulting composite image can still be subject to all of the other issues associated with this type of photograph.

A series of layered images with masking can be used to either increase of decrease the depth of field to accentuate a central image by adding a blurred background, or even showing two objects that normally are not in the same focal plane as both being in focus by 'building up' the photograph. This was a technique that was done even with film.

There are some photostitching tools that look for the most clearly defined, highest contrast transition or sharpest edges to link images and in doing so effectively make the final product look better. By using a manual mode to specify the exact image set to be stitched or combined, a series of shallow depth of field or out of focus elements can be included to soften the image or create a photograph where the DOF is very restricted.

Unless a large panorama or very high pixel count photo is required, it is a lot of work to get a great result. Some cameras that build a panorama in the camera now, when set to the pano mode will use the highest possible Aperture available to produce an image that is easier to 'connect' with the appropriate adjacent image.