Claims such as this do a disservice to readers by raising false expectations.
At both 50 and 100 yards, there's a difference between getting occasional good results with inexpensive non-match ammo such as CCI SV and getting regular and consistent good results. While it's not surprising to achieve some MOA groups at 50 with ammo such as CCI SV, it must be noted that seeing the same for 100 yards becomes increasingly unlikely because .22LR performance is not linear. It gets worse and worse as distance increases.
If the results described with either CCI SV regular and consistent -- that is, more or less all the time -- that experience is literally quite incredible. Few shooters make the claim, let alone back it up. Similarly, if SK Standard Plus delivers regular and consistent .75 MOA at both 50 and 100 -- regardless of rifle -- it is also equally incredible. Neither CCI SV nor SK Standard Plus can be expected to deliver MOA or better performance on anything like a regular basis at 50 and especially at 100.
I have thrown multiple thousands of various rounds of .22LR down range between my various .22 PRS rifle setups over the years. I understand how to measure groups and wouldn't be making these statements in a flippant way.
Shooting from the bench out of my 10/22 build, CCI SV regularly preforms MOA at 50/100 yds. Out of my RimX with a 1:12 PVA barrel at 50/100 SK Standard Plus regularly preforms sub MOA and is quite similar to Long Range Match at those ranges. Where I notice the difference between Standard+ and LRM is 250y+.