Wow, that's incredible! Or maybe it's not. I haven't been brewing beer for a good 8 years now, so maybe this is something that's been the norm for a while and I just didn't know it. That spec sheet doesn't say if it comes from 2 row or 6 row barley, but I would guess it must be 6 row to have that much diastatic power. I recently dug out an old Northern Brewer gift card I forgot I had from years ago, and now I'm thinking I should see if they carry a product like this.
Well, this question led me to search for a more satisfying answer during lunch today, and unsurprisingly, that search led me right back here.

From the site’s glossary:
“DIASTATIC MALT
A barley malt commonly used in flours to increase the extraction of sugars from the flours for use as food for the yeast during fermentation and to increase the residual sugars in the dough at the time of baking to promote increased crust browning. The diastatic malt is produced from barley that has been sprouted, dried and ground into flour. The diastatic malt works through enzymatic activity (it provides additional alpha-amylase) to release sugar from the damaged starch molecules of flour. Diastatic malt is available in both dry and liquid form. The amount of diastatic malt to use should not be so excessive as to cause the dough after mixing to be slack or sticky inasmuch as this can result in a gummy crumb in the baked crust. There are also forms of diastatic malt, sometimes called low diastatic malt blends that, in addition to including barley malt, also include a form of sugar (usually dextrose) and wheat flour. These blends have degrees Lintner values that are considerably lower than 100 percent diastatic malts, which typically have Lintner degrees values of around 200. See, also, LINTNER VALUE.
LINTNER VALUE
A measure of the degree of enzymatic activity (alpha amylase enzyme) of a diastatic malt or diastatic malt blend. The measure of enzymatic activity is stated in degrees Lintner. A pure malt, in the form of a cereal barley malt flour without addition of other ingredients as are used with diastatic malt blends (more below), can have a typical degrees Lintner value of about 200–210L. Blends of diastatic malt, which typically also include a form of sugar (usually dextrose) and a wheat flour carrier, can have typical degrees Lintner values of 100L, 60L and 20L, with the 60L and 20L values being the most common among the lower degrees Lintner values. The latter two blends are often called low diastatic malts, or LDMs.”
So, the LDMs seem to be just pure barley cut with sugar and flour. Which I think means two things. One, at 2%, I am probably overdoing it by a fair bit by using pure barley malt. Two, it may be best to use pure malt and to “cut it” yourself simply by reducing the amount used then it is to go with a brand that effectively is adding their own fillers to the product to lower the enzymatic performance of the malt.
Likely not a negligible difference in quality for homemade pizza given the scale, but perhaps interesting.