Prostrate knotweed?

I haven't actually gone out to take a closer look to confirm, but it's very possible that the weed that has infested the front lawn this year and last is prostrate knotweed. Purdue Turf Tips had a post about the weed last month and it looks and sounds like what I see in our lawn:

Prostrate knotweed in grass?

I'm trying to figure out what to do about it (assuming this is what it is). The blog post suggests some chemical treatments:

2,4-D by itself will provide only fair control of prostrate knotweed, but when combined with triclopyr (Turflon Ester Ultra or Triclopyr 4) or dicamba (Banvel, Vanquish), it should provide excellent control in cool-season turf. There are many combination products that contain 2,4-D and dicamba, including Trimec 992 and SpeedZone. Combination products that contain 2,4-D and triclopyr include 4-Speed XT, Chaser, Chaser 2 Amine, Momentum FX2, Turflon II amine, and TZONE.

Most of these are professional products that aren't typically sold in stores and are often sold in bulk.

The Ortho Weed B Gon Max label lists the weed and (I think) shows 2,4-D and dicamba as active ingredients, so I may give this a try since it should be easier to get a hold of and not in mass quantity. It appears that Bayer Advanced All-In-One Lawn Weed & Crabgrass Killer and Spectracide Weed Stop for Lawns plus Crabgrass Killer also have similar labels.

Last year I sprayed it with Ortho Weed B Gon and they eventually yellowed (making them stand out even more) and died off. It took some time, though.

First step will be to confirm that this is in fact the weed in our lawn. Will report back.