I2cdetect shows no devices on the bus

From the schematic, Its mentioned the following are the I2C devices . But from software its different i2c address.

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root@swi-mdm9x28:~# i2cdetect -r -y 4
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – 04 05 06 07 – – – – – – – –
10: – – – – – – – – – – UU – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – – – – – UU – – – – –
40: – – – – – – – – – – – – – – – –
50: – 51 – – – – – – – – – – – – – –
60: – – – – – – – – 68 – – – – – – –
70: – 71 – – – – 76 –

Am I missing something here ? what are these additional devices ?
Is there any document describing the list of i2c devices ?

Thanks