Nay might have been refering to MAF 4+ panhards. They are a completely different animal and have some spherical joint at one end.
Personally if you want the adjustable panhard to work better during flex you can just leave the lock nut loose so it can rotate on the threads.
Yes, the 4+.
4+Plus 80 Series Super HD Adjustable Rear Panhard Rod
Unbelievably, the regular poly cost as much as these...it's a no brainer to go 4+ if you are going MAF. MAF's poly used to be $199...I wonder if that is an error.
Ignore LT's suggestion to just run a poly bushing on the threads with a loosened nut for more flex

. I have seen this approach in the past and it may not wear well and if not will get noisy.
There is a front panhard with spherical bearing - if you will be modifying the front end I recommend this approach highly.
I have also run the Slee panhard, which was fine. I thought it was causing some noise in the poly bushings, which is why I went MAF, but it was something else. I have a bias against plastic bushings just because I have tried so many times to make them work without any long term success. The new polyester Slee bushings may in fact prove to match rubber, but at the end of the day plastic has a singular proven advantage: short term cost.
I was concerned about the spherical bearing getting noisy, but so far after 8 months zero issues with zero maintenance. But I still run a stock front panhard - only the rear is 4+. On a 3.5" lift, the angle of the panhards is so minimal that they don't cause any issues. I'd raise the rear mount with a MAF 4+ bar if I was planning a 7" lift and say 40" tires.
In other lines of modified rigs, you see people who are getting hardcore with trail biased rigs go to fairly big lengths to get "bushings" out of the system entirely, because they are pushing the limits of any kind of bushing flex in terms of durability/reliability and at some point the movement a bushing allows in flex it will also allow in deflection in trying to control very large tires on the highway. That is why johnny joints are very popular, and these MAF 4+ joints built into the arm end are perhaps an even better solution when you look at the load ratings of a spherical end of that size.
If you are really headed this way and moving to say a 14" travel shock, it will be worth assessing all of these links up front before you start spending coin you may be likely to spend twice.