What does "Current message level: 0x00000033 (51)" mean?
The key phrase from the NETIF Msg Level document1 referenced by the What is the “Current message level”? question (and quoted by nelaaro’s answer to this question) is “The variable is a bit map ….”
You are asking about message level 0x00000033.
0x33 = 0x1 | 0x2 | 0x10 | 0x20,
so that message level is equivalent to
NETIF_MSG_DRV + NETIF_MSG_PROBE +
NETIF_MSG_RX_ERR + NETIF_MSG_TX_ERR +
NETIF_MSG_TX_QUEUED + NETIF_MSG_INTR.
You may be able to find details of what that means
in the source code for the Linux Ethernet driver, or its documentation.
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1 The content of the "NETIF Msg Level" document
is available in unformatted, text-only form
in the Documentation/networking/netif-msg.txt file
in the kernel source,
and also here (which has some markup) and here.