At the presentation those were told to not be defaults, so thats why he asked for people to take a look and change them. I am just informing what I saw and I can confirm in a project I just changed to raytracing those came with different settings, since the project was migrated from previous releases, so maybe a new project in 4.23 they come with those already set with correct values, gotta check this myself.
PS: Created a new 3rd person blueprint project in 4.23, values for those parameters were: Default and 128 as stated. Changed to Raytracing, restarted, they were the same. Changed RHI to Dx12, those still the same, so you need to change them yourself for better results. Unless those were mentioned anywhere else people won’t know they are needed and we got a lot of new comers to the engine aswel.