So I found the Sun article. Ignoring the headline, which is probably written by someone other than the author of the piece, the text of the article doesn't mention sister clubs at all.
It talks first about off-shore payments to agents and then adds that a club is using foreign "partner" clubs to disguise amounts paid for transfers into their UK squads.
It then goes on to say that these "off-shore" payments by "partner clubs" have often been made as "scouting agreements" and that 16 transfers are being reviewed.
It then goes on to talk about satellite teams and how many PL club owners have them (strange observation about owners).
So, to conclude. Assuming the writer is able to properly express what he is trying to talk about .... a PL club is using its European satellite clubs to pay "scouting arrangements" to agents as part of at least 16 transfers into its UK squads. Not much to go on there.
I suppose this could be something to do with CFG and a group-wide scouting network, some misunderstanding of sophisticated shared service processes and a willingness from some clubs to throw shit in the direction of CFG because they are losing out. But I doubt anything CFG has done is anything less than squeaky clean from the accounting, fiscal and FFP viewpoint.