boton = driver.find_element_by_id('tabComments_btn')
boton.click()

wait = WebDriverWait(driver, 100)

driver.execute_script("window.scrollTo(0, 1300)")
botonTodos= driver.find_element_by_class_name('thread-node-children-load-all-btn')

wait = WebDriverWait(driver, 100)

botonTodos.click()

wait.until(EC.presence_of_element_located((By.CLASS_NAME, 'thread-node-message')))

for elm in driver.find_elements_by_css_selector(".thread-node-message"):
    print(elm.text)

<a href="#" class="thread-node-btn thread-node-children-load-next-btn">Load next 10 comments</a>
    <a href="#" class="thread-node-btn thread-node-children-load-all-btn">Load all comments</a>
    <a href="#" class="thread-node-btn thread-node-btn-post">Publicar un comentario</a>