I don't think Marcellus is a hater, and his take seems credible, knowing the way BB operates:
Why Ex-NFL DE Thinks Bill Belichick Has Issue With Tom Brady Amid Talk Of QB’s Future
Year Team G Att Comp Pct Att/G Yds Avg Yds/G TD TD% Int Int% Lng 20+ 40+ Sck SckY Rate
2019
New England Patriots 7 273 180 65.9 39.0 1,992 7.3 284.6 11 4.0 4 1.5 58T 32 3 10 73 94.8
2018
New England Patriots 16 570 375 65.8 35.6 4,355 7.6 272.2 29 5.1 11 1.9 63T 53 8 21 147 97.7
2017
New England Patriots 16 581 385 66.3 36.3 4,577 7.9 286.1 32 5.5 8 1.4 64T 62 10 35 201 102.8
2016
New England Patriots 12 432 291 67.4 36.0 3,554 8.2 296.2 28 6.5 2 0.5 79T 45 8 15 87 112.2
2015
New England Patriots 16 624 402 64.4 39.0 4,770 7.6 298.1 36 5.8 7 1.1 76T 58 12 38 225 102.2
2014
New England Patriots 16 582 373 64.1 36.4 4,109 7.1 256.8 33 5.7 9 1.5 69T 44 8 21 134 97.4
2013
New England Patriots 16 628 380 60.5 39.2 4,343 6.9 271.4 25 4.0 11 1.8 81T 49 8 40 256 87.3
2012
New England Patriots 16 637 401 63.0 39.8 4,827 7.6 301.7 34 5.3 8 1.3 83T 57 8 27 182 98.7
2011
New England Patriots 16 611 401 65.6 38.2 5,235 8.6 327.2 39 6.4 12 2.0 99T 71 14 32 173 105.6
2010
New England Patriots 16 492 324 65.9 30.8 3,900 7.9 243.8 36 7.3 4 0.8 79T 53 9 25 175 111.0
2009
New England Patriots 16 565 371 65.7 35.3 4,398 7.8 274.9 28 5.0 13 2.3 81T 43 12 16 86 96.2
2008
New England Patriots 1 11 7 63.6 11.0 76 6.9 76.0 0 0.0 0 0.0 26 1 0 0 0 83.9
2007
New England Patriots 16 578 398 68.9 36.1 4,806 8.3 300.4 50 8.7 8 1.4 69T 56 15 21 128 117.2
2006
New England Patriots 16 516 319 61.8 32.2 3,529 6.8 220.6 24 4.7 12 2.3 62T 46 8 26 175 87.9
2005
New England Patriots 16 530 334 63.0 33.1 4,110 7.8 256.9 26 4.9 14 2.6 71 59 9 26 188 92.3
2004
New England Patriots 16 474 288 60.8 29.6 3,692 7.8 230.8 28 5.9 14 3.0 50 52 10 26 162 92.6
2003
New England Patriots 16 527 317 60.2 32.9 3,620 6.9 226.2 23 4.4 12 2.3 82T 44 8 32 219 85.9
2002
New England Patriots 16 601 373 62.1 37.6 3,764 6.3 235.2 28 4.7 14 2.3 49T 37 3 31 190 85.7
2001
New England Patriots 15 413 264 63.9 27.5 2,843 6.9 189.5 18 4.4 12 2.9 91T 32 6 41 216 86.5
Yards per game of 286 in 2019 would rank in-line with most stuff from last 10 years. Keep in mind Brady stops throwing in 4th Q since we're having blowout wins. This isn't like 2007 after Spygate where Pats kept throwing all the way.
Yards per Attempt of 7.3 would be higher than 2013 and 2014 but marginally lower than other years. Nothing crazy.
Passing offense rank is #5.
Basically passing volume is still good. Efficiency is ok. Both those are slightly above and slightly below 10 years average. Nothing crazy here. Decline implies a significant drop off. Considering the drop-off in talent from last year (Gronk in particular, who averaged 17 yard per target and a QBR of 120 or something whenever Brady targetted him) the rest performance might even have improved.