I use a single point 3 point hitch ripper for laying electrical cable but you need a tractor with balls, front wheel assist, R1 bar tread tires and substantial weight to do it. The one I own you can actually feed the cable or plastic water pipe through the ripper frame and into the bottom of the ripper shank point the install whatever you are installing. Up here however, water lines must be 48" or better to not freeze so when I do that (rarely), I use a rented ditch witch or for a short run, I borrow one of my friends, TLB's with a narrow ditching bucket on it.
Go rent one is my comment and the chainsaw one in the video, looks to me like a dirty, nasty setup. Much better to rent one and not have to deal with what I consider a heavy maintenance item. All dirt or whatever is highly abrasive to begin with.
If you have a tractor with sufficient balls (I own 3 in the 90-100 pto power range and all are FWA and all are pretty heavy (7-10K range), a single point cable plow (not vibrating which is what most phone and utility companies use) or a dedicated trencher, works and they are not expensive, less than 500 bucks but maybe more with inflation, but not much more I'd hope and any tractor dealer or farm box store like TSC can either have one or can get you one.
A vibrating single point does the job faster, can sever small tree roots and displace smaller buried rocks too but they aren't cheap and require hydraulic remotes and sufficient fluid flow to run the hydraulic powered vibrating power pack but they still require a tractor with sufficient balls and tractive weight.
Have fun and rent one because the onus of maintenance of one lies with the rental company, not you.