"you cant extrapolate rock chips grade to pegmatite intercepts...

"you cant extrapolate rock chips grade to pegmatite intercepts at depth."
Yes you can. Otherwise why would you ever assay rock chips? Just drill blind if rock chips aren't representative of the system below.

"there were a lot of NSR results amidst the higher grade rock chips"
There were 4 low grade samples. 4 is not "a lot". There were 10 extremely high grade samples. All the samples that have zero lithium mineralisation are likely wall-rock. The average grade of lithium in the mineralised samples is 2.5% Li2O. The average grade of the non-mineralised samples is 0.0325% Li2O - barely anomalous, more than likely background Li2O hence non-pegmatitic material inference.

	Sample ID	East	North	Grid	Li2O %
1	S10014	360626	6515777	MGA94_51S	3.7
2	S10017	360605	6515513	MGA94_51S	3.6
3	S10021	360623	6515783	MGA94_51S	3.04
4	S10019	360647	6515683	MGA94_51S	2.91
5	S10015	360560	6515555	MGA94_51S	2.86
6	S10025	360576	6515509	MGA94_51S	2.73
7	S10013	360661	6515800	MGA94_51S	2.61
8	S10026	360630	6515771	MGA94_51S	1.66
9	S10022	360640	6515624	MGA94_51S	1.45
10	S10023	360661	6515860	MGA94_51S	1.21
11	S10016	360681	6516024	MGA94_51S	0.09
12	S10018	360691	6516025	MGA94_51S	0.03
13	S10020	360627	6515622	MGA94_51S	0.01
14	S10024	360672	6515818	MGA94_51S	0
15
16				AVERAGE PEGMATITE	2.577
17				AVERAGE WALLROCK	0.0325

"also pegmatites arent necessarily made up of spodumene- the lithium bearing mineral and the grade is unknown"
If you can't see the spodumene here, I can't help you. Even the company has labelled it for you.