Thanks for your response and clarity.
Looking at below from BCPNP program guid, I thought those requirement can be ignore with employee letter
Other  Considerations 
"At  its  sole  discretion,  the  BC  PNP  may  consider  an  application  where  the  supporting  employer  does not  meet  the  minimum  requirements,  including  but  not  limited  to,  considering  registered  businesses that  are  regular  partnerships  or  sole  proprietorships.  However,  in  order  to  be  considered,  the supporting  employer  must,  at  the  time  of  application,  make  a  compelling  business  case  in  writing  to the  BC  PNP  that  demonstrates  how  the  nomination  will  generate  significant  economic  benefits  to  B.C."