I think what the poster means is Loui Eriksson's production fell off a cliff after he left the Bruins:
[TABLE=collapse]
[TR]
[TD]
2015–16[/TD]
[TD]Boston Bruins[/TD]
[TD]NHL[/TD]
[TD]82[/TD]
[TD]30[/TD]
[TD]33[/TD]
[TD]63[/TD]
[TD]12[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[/TR]
[TR]
[TD]
2016–17[/TD]
[TD]
Vancouver Canucks[/TD]
[TD]NHL[/TD]
[TD]65[/TD]
[TD]11[/TD]
[TD]13[/TD]
[TD]24[/TD]
[TD]8[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[/TR]
[TR]
[TD]
2017–18[/TD]
[TD]Vancouver Canucks[/TD]
[TD]NHL[/TD]
[TD]50[/TD]
[TD]10[/TD]
[TD]13[/TD]
[TD]23[/TD]
[TD]4[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[/TR]
[TR]
[TD]
2018–19[/TD]
[TD]Vancouver Canucks[/TD]
[TD]NHL[/TD]
[TD]81[/TD]
[TD]11[/TD]
[TD]18[/TD]
[TD]29[/TD]
[TD]22[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[TD]—[/TD]
[/TR]
[TR]
[TD]
2019–20[/TD]
[TD]Vancouver Canucks[/TD]
[TD]NHL[/TD]
[TD]49[/TD]
[TD]6[/TD]
[TD]7[/TD]
[TD]13[/TD]
[TD]12[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[/TABLE]
Going from 30G 63P to averaging ~10G and 20 or so points is not what I'd call on a par with what Vatrano,
Thornton, Seguin, Wheeler, Kessel, and Hamilton did post-Bruins.