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The description above mentions that they pulled AD0 high, so 0x69 is the expected address.
Since I2C is synchronous any data rate will work so try 20,000 -100,000 Hz first
I don't think the logic level converter will work with I2C. The lines are bi-directional and both the CLK and SDA lines may not be driven to a logic high.
What value pull-up are you using?
How long are the SDA and CLK lines? Shorter than a couple of meters is recommended.
Have you looked at the CLK & SDA lines with an O'scope to confirm what is being sent and the the slave ACKs?
Have you tried using 0xD0 or 0xD2 in WebbotLib?