That slide is utter crap. It isn't comparing processors of the same line. Comparing the price of the x9x0 series to the x8x0 series is just intellectual dishonesty on the left side of the slide. Same goes with comparing a chip that is the 4th HEDT chip (6950X) to the 3rd HEDT chip (7900X).
To know what is really going on, compare the same price tier chip. For example, the chip at about the $1000 price level should be compared:
If you notice, with the exception of 2016, there was always the 3rd from the bottom HEDT chip at exactly $999. The number of cores steadily increased. So, going by the number of cores is just silly. If Ryzen caused cores to go up, then Ryzen had a tremendous impact in the year 2010 and 2014 as well! Instead, Ryzen prevented the $1089 price from sticking.
- Intel's 3rd from bottom HEDT in Skylake (2017): 7900X, 10 cores, 3.3 GHz, $999
- Intel's 3rd from bottom HEDT in Broadwell (2016): 6900X, 8 cores, 3.2 GHz, $1089
- Intel's 3rd from bottom HEDT in Haswell (2014): 5960X, 8 cores, 3.0 GHz, $999
- Intel's 3rd from bottom HEDT in Ivy Bridge (2013): 4960X, 6 cores, 3.6 GHz, $999
- Intel's 3rd from bottom HEDT in Sandy Bridge (2012): 3970X, 6 cores, 3.5 GHz, $999
- Intel's 3rd from bottom HEDT in Westmere (2011): 990X, 6 cores, 3.46 GHz, $999
- Intel's 3rd from bottom HEDT in Westmere (2010): 990X, 6 cores, 3.33 GHz, $999
- Intel's 3rd from bottom HEDT in Nehalem (2009): 975, 4 cores, 3.33 GHz, $999
- Intel's 3rd from bottom HEDT in Nehalem (2008): 965, 4 cores, 3.2 GHz, $999
Intel almost always prices chips into the same slots (except when there are major core changes, then there may be new slots). What you get with Intel is more features for the same price.
Other than Broadwell core i7 6950x (10 core) priced at USD 1723 and core i7 6900x (8 core) priced at USD 1089 every Intel HEDT flagship CPU from Nehalem 965 till Haswell 5960x has been priced at USD 999. More importantly due to AMD Ryzen Threadripper this is the first time Intel has been forced to use their Xeon MCC (Medium core count) die for HEDT. Broadwell Xeon had a MCC die with 14 cores and Haswell Xeon had a MCC die with 12 cores but Intel never had to use it as AMD was not competing.