Pure FUD. Solo blocks are not shared with pool miners. The finder (solo or pool)
gets the tx fees for the block they found. The pool has no control over this.
Internal transactions don't exist on the blockchain, the're just for accounting.
PPLNS has nothing to do with how much a block pays out, only how to split
the block reward among the pool miners, and only for blocks found by the pool.
This is how flexpool operates. They try disparage and discredit other pools to make themselves look like the best pool to use. They have shills all over reddit with 1-2day mining comparisons showing why everyone should switch

. Its pretty comical to see but surprising how many new miners fall for it and are actually switching over.