Sure it's only assumption, but that tweet is the only substantial information (from a legit guy) we have. He was talking about 120hz gaming and for now it seems he is completely right as most 120hz games run better (including the last COD at the same resolution) or the same on PS5 when they shouldn't on paper: slower clocks on PS5, reduced GDDR6 bandwidth and even half FPU power.Without an actual comparison, it might be assuming too much about whether the PS5 was being compared to its competitor.
Those numbers are decent, but from what I've seen in other reviews inferior to the standalone chiplet Zen2 products.
The Zen2 APUs seemed to have even better inter-ccx latencies.
It took something like the 3950X to get latencies in this range.
Perhaps the other chip could have worse latencies, if the lower GPU clock somehow reduced the data fabric speed. This data in isolation isn't presenting a serious challenge at mildly to significantly longer latency than various Zen2 products.