They blame techies for the hike of real-estate price,
[...] they also oppose any construction of high density
accommodation
My theory is there are three parties in this discussion.Renter Roy can't afford a house, and thinks tech companies' money is bidding up prices. Homeowner Harold has lived and worked in this neighbourhood for 40 years and doesn't want its character to change and his house's value to fall. Techie Tammy wants somewhere to live, she'd prefer not to spend a fortune to live in a hovel while her neighbours shame her for gentrifying.
Any pair of Roy, Harold and Tammy can get on OK - but it's just not possible for all three of them to get what they want.
There seems to be a contradiction - but that's because any time Roy and Tammy are about to agree, Harold is motivated to enter the conversation and disagree - and the same thing happens when Harold and Tammy are about to agree.