I think so. Here is the relevant code snippet: https://github.com/bitcoinknots/bitcoin/blob/eeb9cc1120661d0e9fd28ddb6fef2c04992a4666/src/script/script.cpp#L329
It is a function called DatacarrierBytes and I don't know c++ all that well but it appears to match transactions containing OP_FALSE OP_IF or OP_RETURN, and counts the number of bytes they carry as a payload. I assume this function gets called wherever the data arrives filter is applied, which I suppose is probably in policy.cpp -- though I haven't checked
