LJM MX50 kit amp

Hello.
Recently I've purchased a MX50 dual pcb + components kit from aliexpress.
https://it.aliexpress.com/item/1005...t_main.16.1fb13696tti5pw&gatewayAdapt=glo2ita

During assembly I've noted some differences between my past assembly and this one.
Now I have a trimmer (5k to regulate bias), but mainly I've discovered difference in BJT 2n5551 (Q), strange configuration, different from usual.

Is it plausible or a complete mistake in design?

Could it work?

Tkankyou.
 

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